<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) Jeff Flake (Republican) Doug Marks (Libertarian) Jim Moss (Democratic) Chris Russell (Democratic) Richard Sherzan (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) Topher Brennan (Democratic) 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>

Who is up for re election in 2018