Tuesday’s contests set up the slates in Illinois, Ohio and North Carolina and signal tough general elections in these battleground states.
Sen. Mark Kirk (R-Ill.) tops the list as the most vulnerable incumbent as he faces a high-profile Democratic challenger in a state that went to President Obama in both the 2008 and 2012 elections.
Many of the vulnerable Republicans have said they’ll back Trump if he’s the GOP nominee and Democrats have already used their support to link them to the controversial front-runner.
The upheaval over President Obama’s Supreme Court nominee only further complicates Republican’s chances to hold onto their small majority.
Here’s a list of the top 10 Senate seats most likely to flip this cycle….