Rep. Tom CottonTom CottonCotton: I hope we go back to health care next year Sunday shows preview: GOP gears up for Senate tax reform push A simple way to make America even greater is fixing our patent system MORE (R-Ark.) is fundraising off the 41st anniversary of Roe v. Wade, the Supreme Court decision that legalized abortion nationwide.

"I am proud to have fought (and will continue fighting) for pro-life legislation in Congress. However, like most of the legislation my fellow conservative House members and I pass, the U.S. Senate blocks those bills from becoming law," the Senate candidate writes in an email to supporters before asking for donations. "This is just another reason we need to take back the Senate from Harry Reid and President Obama's other close allies."

Abortion could become an issue in the race between Cotton and Sen. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.).

Pryor has been touting his religious beliefs in the socially conservative state, running ads featuring the Bible as a way to show he's different than President Obama and national Democrats.

The senator has a mixed record on abortion — he's said he personally opposes it except in cases of rape, incest or the life of the mother and has voted at times for more restrictive abortion laws like parental notification laws, but at times has voted with those who support keeping abortion legal.

"I've always leaned toward the pro-life side of that, but I don’t fit neatly into any of the categories," Pryor told an Arkansas television station when asked about his view on abortion last April. "I certainly respect that there are circumstances where the woman should be able to make that decision. Of course, I want that to be as infrequent as possible. But I do think that there are times when a woman should make that decision."