<Tr> <Th> Indiana 9 </Th> <Td> R + 13 </Td> <Td> Trey Hollingsworth </Td> <Td> Republican </Td> <Td> 2016 </Td> <Td> Incumbent renominated . </Td> <Td> Trey Hollingsworth (Republican) Liz Watson (Democratic) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> District </Th> <Th_colspan="3"> Incumbent </Th> <Th> Results </Th> <Th> Candidates </Th> </Tr> <Tr> <Th> Location </Th> <Th> 2017 PVI </Th> <Th> Representative </Th> <Th> Party </Th> <Th> First elected </Th> </Tr> <Tr> <Th> Iowa 1 </Th> <Td> D + 1 </Td> <Td> Rod Blum </Td> <Td> Republican </Td> <Td> 2014 </Td> <Td> Incumbent renominated . </Td> <Td> Rod Blum (Republican) Abby Finkenauer (Democratic) Henry Gaff (Green) </Td> </Tr> <Tr> <Th> Iowa 2 </Th> <Td> D + 1 </Td> <Td> Dave Loebsack </Td> <Td> Democratic </Td> <Td> 2006 </Td> <Td> Incumbent renominated . </Td> <Td> Daniel Clark (Independent) Dave Loebsack (Democratic) Christopher Peters (Republican) </Td> </Tr> <Tr> <Th> Iowa 3 </Th> <Td> R + 1 </Td> <Td> David Young </Td> <Td> Republican </Td> <Td> 2014 </Td> <Td> Incumbent renominated . </Td> <Td> Cindy Axne (Democratic) Mark G. Elworth, Jr . (Legal Medical Now) Bryan Jack Holder (Libertarian) Paul Knupp (Green) David Young (Republican) </Td> </Tr> <Tr> <Th> Iowa 4 </Th> <Td> R + 11 </Td> <Td> Steve King </Td> <Td> Republican </Td> <Td> 2002 </Td> <Td> Incumbent renominated . </Td> <Td> Charles Aldrich (Libertarian) Steve King (Republican) J.D. Scholten (Democratic) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> District </Th> <Th_colspan="3"> Incumbent </Th> <Th> Results </Th> <Th> Candidates </Th> </Tr> <Tr> <Th> Location </Th> <Th> 2017 PVI </Th> <Th> Representative </Th> <Th> Party </Th> <Th> First elected </Th> </Tr>

Who are the candidates for the house of representatives