A list of of republicans in Obama (2012) states and democrats in Romney states in the Senate and Governorships.
Democrats (Republican Targets)Senate:2014: Mark Begich (D-AK)
Mark Pryor (D-AR)
Mary Landrieu (D-LA)
OPEN (D-MT)
Kay Hagan (D-NC)
OPEN (D-SD)
OPEN (D-WV)
2016:NONE
2018:Joe Donnelly (D-IN)
Claire McCaskill (D-MO)
Jon Tester (D-MT)
Heidi Heitkamp (D-ND)
Joe Manchin (D-WV)
Governorships:2013:NONE
2014:OPEN (D-AR)
2015:OPEN (D-KY)
2016:OPEN (D-MO)
Steve Bullock (D-MT)
OPEN (D-WV)
Republicans (Democratic Targets)Senate:2014:Susan Collins (R-ME)
2016:Marco Rubio (R-FL)
Mark Kirk (R-IL)
Chuck Grassely (R-IA)
Kelly Ayotte (R-NH)
Rob Portman (R-OH)
Pat Toomey (R-PA)
Ron Johnson (R-WI)
2018:Dean Heller (R-NV)
Governorships:2013:Chris Christie (R-NJ) (obviously safe)
OPEN (R-VA)
2014:Rick Scott (R-FL)
Terry Branstad (R-IA)
Paul LePage (R-ME)
Rick Snyder (R-MI)
Brian Sandoval (R-NV)
Susana Martinez (R-NM)
John Kasich (R-OH)
Tom Corbett (R-PA)
Scott Walker (R-WI)
2015:NONE
2016:NONE
Conclusion: The democrats should have a good Senate year in 2016, and a good governor year in 2014. Meanwhile the republicans should have good Senate years in 2014 and 2018, and possibly a good governor year in 2016.