<P> In these general elections, the winners will be elected for the term beginning January 2019 . </P> <P> All of the elections involved the Class 1 seats; ordered by state . </P> <Table> <Tr> <Th> State (linked to summaries below) </Th> <Th_colspan="3"> Incumbent </Th> <Th> Intent / Results </Th> <Th> Candidates (listed alphabetically) </Th> </Tr> <Tr> <Th> Senator </Th> <Th> Party </Th> <Th> Electoral history </Th> </Tr> <Tr> <Td> Arizona </Td> <Td> Flake, Jeff Jeff Flake </Td> <Td> Republican </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Deedra Abboud (Democratic) Craig Brittain (Republican) Jeff Flake (Republican) Doug Marks (Libertarian) Jim Moss (Democratic) Chris Russell (Democratic) Richard Sherzan (Democratic) Kyrsten Sinema (Democratic) Nicolas Tutora (Republican) Kelli Ward (Republican) </Td> </Tr> <Tr> <Td> California </Td> <Td> Feinstein, Dianne Dianne Feinstein </Td> <Td> Democratic </Td> <Td> 1992 (special) 1994 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Donald R. Adams (Independent) Jerry Leon Carroll (Independent) Michael Eisen (Independent) Dianne Feinstein (Democratic) Tim Gildersleeve (Independent) Eugene Patterson Harris (Democratic) David Hildebrand (Democratic) Charles Junior Hodge (Independent) Timothy Charles Kalemkarian (Republican) Caren Lancona (Republican) Richard Thomas Mead (Independent) John Melendez (Democratic) Douglas Howard Pierce (Democratic) Joseph Sandberg Stephen James Schrader (Republican) Steve Stokes (Democratic) </Td> </Tr> <Tr> <Td> Connecticut </Td> <Td> Murphy, Chris Chris Murphy </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Ann - Marie Adams (Democratic) Matthew Corey (Republican) Chris Murphy (Democratic) Dominic Rapini (Republican) </Td> </Tr> <Tr> <Td> Delaware </Td> <Td> Carper, Tom Tom Carper </Td> <Td> Democratic </Td> <Td> 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Tykiem Booker (Democratic) Tom Carper (Democratic) Chuck Boyce (Republican) </Td> </Tr> <Tr> <Td> Florida </Td> <Td> Nelson, Bill Bill Nelson </Td> <Td> Democratic </Td> <Td> 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Joe Allen (Independent) Lateresa Ann Jones (Republican) Edward Janowski (Independent) Tamika Lyles (Democratic) Bill Nelson (Democratic) Marcia Roberta Thorne (Republican) Joe Wendt (Libertarian) </Td> </Tr> <Tr> <Td> Hawaii </Td> <Td> Hirono, Mazie Mazie Hirono </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Mazie Hirono (Democratic) </Td> </Tr> <Tr> <Td> Indiana </Td> <Td> Donnelly, Joe Joe Donnelly </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Mike Braun (Republican) Joe Donnelly (Democratic) Terry Henderson (Republican) Mark Hurt (Republican) Luke Messer (Republican) Todd Rokita (Republican) Kiel Richard Stone (Republican) Andrew Takami (Republican) Andrew U.D. Straw (Disability Party) </Td> </Tr> <Tr> <Td> Maine </Td> <Td> King, Angus Angus King </Td> <Td> Independent </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Eric Brakey (Republican) Angus King (Independent) Zak Ringlestein (Democratic) </Td> </Tr> <Tr> <Td> Maryland </Td> <Td> Cardin, Ben Ben Cardin </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Ben Cardin (Democratic) Sam Faddis (Republican) Richard "Rikki" Vaughn (Democratic) Arvin Vohra (Libertarian) Debbie "Rica" Wilson (Democratic) </Td> </Tr> <Tr> <Td> Massachusetts </Td> <Td> Warren, Elizabeth Elizabeth Warren </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Elizabeth Warren (Democratic) Shiva Ayyadurai (Republican) Geoff Diehl (Republican) Mary Lindstrom (Republican) Darius Mitchell (Republican) Allen Waters (Republican) Heidi Wellman (Republican) James Devine (Independent) Joshua Ford (Independent) </Td> </Tr> <Tr> <Td> Michigan </Td> <Td> Stabenow, Debbie Debbie Stabenow </Td> <Td> Democratic </Td> <Td> 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> John James (Republican) Robert P. Young Jr . (Republican) Craig Allen Smith (Democratic) Debbie Stabenow (Democratic) Marcia Squier (independent) </Td> </Tr> <Tr> <Td> Minnesota </Td> <Td> Klobuchar, Amy Amy Klobuchar </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Amy Klobuchar (Democratic) Jim Newberger (Republican) </Td> </Tr> <Tr> <Td> Mississippi </Td> <Td> Wicker, Roger Roger Wicker </Td> <Td> Republican </Td> <Td> 2007 (appointed) 2008 (special) 2012 </Td> <Td> Incumbent running </Td> <Td> Jensen Bohren (Democratic) Roger Wicker (Republican) </Td> </Tr> <Tr> <Td> Missouri </Td> <Td> McCaskill, Claire Claire McCaskill </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Angelica Earl (Democratic) Josh Hawley (Republican) Claire McCaskill (Democratic) Tony Monetti (Republican) Austin Petersen (Republican) Courtland Sykes (Republican) </Td> </Tr> <Tr> <Td> Montana </Td> <Td> Tester, Jon Jon Tester </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Troy Downing (Republican) Ron Murray (Republican) Albert Olszewski (Republican) Matthew Rosendale (Republican) Jon Tester (Democratic) </Td> </Tr> <Tr> <Td> Nebraska </Td> <Td> Fischer, Deb Deb Fischer </Td> <Td> Republican </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Deb Fischer (Republican) Larry Marvin (Democratic) Jane Raybould (Democratic) </Td> </Tr> <Tr> <Td> Nevada </Td> <Td> Heller, Dean Dean Heller </Td> <Td> Republican </Td> <Td> 2011 (appointed) 2012 </Td> <Td> Incumbent running </Td> <Td> Jay Craddock (Democratic) Sarah Gazala (Republican) Dean Heller (Republican) Bobby Mahendra (Democratic) Jacky Rosen (Democratic) Jesse Sbaih (Democratic) Danny Tarkanian (Republican) </Td> </Tr> <Tr> <Td> New Jersey </Td> <Td> Menendez, Bob Bob Menendez </Td> <Td> Democratic </Td> <Td> 2006 (appointed) 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Lisa McCormick (Democratic) Bob Menendez (Democratic) Sean A. Thom (Democratic) </Td> </Tr> <Tr> <Td> New Mexico </Td> <Td> Heinrich, Martin Martin Heinrich </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Martin Heinrich (Democratic) Mick Rich (Republican) </Td> </Tr> <Tr> <Td> New York </Td> <Td> Gillibrand, Kirsten Kirsten Gillibrand </Td> <Td> Democratic </Td> <Td> 2009 (appointed) 2010 (special) 2012 </Td> <Td> Incumbent running </Td> <Td> Kirsten Gillibrand (Democratic) Rafael Arden Jones Sr. (Republican) David A. Webber (Republican) </Td> </Tr> <Tr> <Td> North Dakota </Td> <Td> Heitkamp, Heidi Heidi Heitkamp </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Tom Campbell (Republican) Heidi Heitkamp (Democratic) Dustin Peyer (Democratic) </Td> </Tr> <Tr> <Td> Ohio </Td> <Td> Brown, Sherrod Sherrod Brown </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Melissa Ackison (Republican) Sherrod Brown (Democratic) Don Elijah Eckhart (Republican) Michael Gibbons (Republican) Josh Mandel (Republican) </Td> </Tr> <Tr> <Td> Pennsylvania </Td> <Td> Casey Jr., Bob Bob Casey Jr . </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Paul Addis (Republican) Cynthia Ayers (Republican) Lou Barletta (Republican) Jeff Bartos (Republican) Bob Casey Jr . (Democratic) Jim Christiana (Republican) Paul DeLong (Republican) Dale Kerns (Libertarian) Bobby Lawrence (Republican) Rick Saccone (Republican) Andrew Shecktor (Republican) </Td> </Tr> <Tr> <Td> Rhode Island </Td> <Td> Whitehouse, Sheldon Sheldon Whitehouse </Td> <Td> Democratic </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Robert Flanders (Republican) Robert Nardolillo (Republican) Sheldon Whitehouse (Democratic) </Td> </Tr> <Tr> <Td> Tennessee </Td> <Td> Corker, Bob Bob Corker </Td> <Td> Republican </Td> <Td> 2006 2012 </Td> <Td> Incumbent retiring </Td> <Td> Bill Bailey (Democratic) Marsha Blackburn (Republican) Larry Crim (Republican) James Mackler (Democratic) Andy Ogles (Republican) </Td> </Tr> <Tr> <Td> Texas </Td> <Td> Cruz, Ted Ted Cruz </Td> <Td> Republican </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Ted Cruz (Republican) Stefano de Stefano (Republican) Aaron Gwaltney (Independent) Irasema Hernandez (Democratic) Dan McQueen (Republican) Beto O'Rourke (Democratic) Dustin Ray Webb (Democratic) </Td> </Tr> <Tr> <Td> Utah </Td> <Td> Hatch, Orrin Orrin Hatch </Td> <Td> Republican </Td> <Td> 1976 1982 1988 1994 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Orrin Hatch (Republican) Mitchell Kent Vice (Democratic) Jenny Wilson (Democratic) Craig Bowden (Libertarian) </Td> </Tr> <Tr> <Td> Vermont </Td> <Td> Sanders, Bernie Bernie Sanders </Td> <Td> Independent </Td> <Td> 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Bernie Sanders (Independent) Jon Svitavsky (Democratic) Folasade Adeluola (Democratic) </Td> </Tr> <Tr> <Td> Virginia </Td> <Td> Kaine, Tim Tim Kaine </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Tim Kaine (Democratic) Corey Stewart (Republican) Ron Wallace (Republican) </Td> </Tr> <Tr> <Td> Washington </Td> <Td> Cantwell, Maria Maria Cantwell </Td> <Td> Democratic </Td> <Td> 2000 2006 2012 </Td> <Td> Incumbent running </Td> <Td> Maria Cantwell (Democratic) Jennifer "GiGi" Ferguson (Democratic) Clay Johnson (Independent) </Td> </Tr> <Tr> <Td> West Virginia </Td> <Td> Manchin, Joe Joe Manchin </Td> <Td> Democratic </Td> <Td> 2010 (special) 2012 </Td> <Td> Incumbent running </Td> <Td> Bo Copley (Republican) Scott Ernst (Republican) Evan Jenkins (Republican) Joe Manchin (Democratic) Patrick Morrisey (Republican) Paula Jean Swearengin (Democratic) </Td> </Tr> <Tr> <Td> Wisconsin </Td> <Td> Baldwin, Tammy Tammy Baldwin </Td> <Td> Democratic </Td> <Td> 2012 </Td> <Td> Incumbent running </Td> <Td> Tammy Baldwin (Democratic) Kevin Nicholson (Republican) John Schiess (Republican) Leah Vukmir (Republican) Mary Jo Walters (Democratic) </Td> </Tr> <Tr> <Td> Wyoming </Td> <Td> Barrasso, John John Barrasso </Td> <Td> Republican </Td> <Td> 2007 (appointed) 2008 (special) 2012 </Td> <Td> Incumbent running </Td> <Td> John Barrasso (Republican) </Td> </Tr> <Tr> <Th> State </Th> <Th> Senator </Th> <Th> Party </Th> <Th> Electoral history </Th> <Th> Intent / Results </Th> <Th> Candidates </Th> </Tr> <Tr> <Th_colspan="3"> Incumbent </Th> </Tr> </Table> <Tr> <Th> State (linked to summaries below) </Th> <Th_colspan="3"> Incumbent </Th> <Th> Intent / Results </Th> <Th> Candidates (listed alphabetically) </Th> </Tr>

Which republicans senators are up for reelection in 2018