Their big bet: Obamacare.
The deadline to enroll in the Affordable Care Act for the year has come and gone. The Obama administration is touting the enrollment numbers as a successful first year, but Republicans think voter anger over the law is here to stay. And so, Republicans running for House and Senate continue to make it central to their campaign.
The full story at CNN.
Footnote: What's scary is that Nate Silver believes that Mr. Cotton has a 70% chance of winning!