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STORY HIGHLIGHTS

Washington (CNN) -- Republicans are going all in, hoping that the payout is big. Like control of the Senate, big.

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.

In the Arkansas Senate race, Republican challenger Tom Cotton is using Obamacare to fund-raise for his race against Democratic incumbent Mark Pryor. The first screen on Cotton's website is a plea for contributions that says, "Obamacare is so bad that Obama doesn't want it. Tell him neither do I."

Fund-raising schemes and campaign advertisements are central to Republican races in red and swing states around the country.

Republican confidence

When Republican David Jolly beat Democrat Alex Sink in Florida's special election for the 13th Congressional District in March, Republicans attributed the win in part to the health care law.

"His (Jolly's) victory shows that voters are looking for representatives who will fight to end the disaster of Obamacare," Republican National Committee Chairman Reince Priebus and co-chair Sharon Day said in an email blast to reporters after the results were tallied.

The deep-pocketed group Americans for Prosperity is playing in dozens of races around the country, and its sole weapon is Obamacare.

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Republicans hit a nerve when it comes to Obamacare