Question: which republicans senators are up for reelection in 2018
Answer: State ( linked to summaries below ) Incumbent Intent / Results Candidates ( listed alphabetically ) Senator Party Electoral history Arizona Flake , Jeff Jeff Flake Republican 2012 Incumbent running 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 ) California Feinstein , Dianne Dianne Feinstein Democratic 1992 ( special ) 1994 2000 2006 2012 Incumbent running Donald R.