Sen. Scott Brown (R-Mass) is bristling at his Democratic opponent's attempts to link him to Rep. Todd Akin (R-Mo.).

A new Elizabeth Warren radio ad plays a clip of Akin and asks, “Just imagine if Republicans win the White House, or gain control of the U.S. Senate.”

“Apparently she’s a little confused as to who she is running against,” Brown told the Boston Herald. “She is running against Scott Brown. I am a pro-choice, independent Republican who has a history of being an independent thinker. ... I know she wants to run against Mitt Romney and Paul Ryan, but she’s running against Scott Brown."

Brown has done more than any other Republican to distance himself from Akin. He was the first senator to call on Akin to resign, and he also wrote a public letter to Republican National Committee Chairman Reince Priebus opposing the abortion ban in the GOP platform.

Asked about his rival in another interview, Brown said, “I don't need Professor Warren talking, or speaking, or commenting on my votes," saying she is "distorting and misleading the voters about where I stand on issues."

Brown leads Warren in the latest Public Policy Polling survey of this blue state. To win, Warren will have to do what she hasn't yet: convince voters that Brown is not so independent from the rest of the GOP.