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The ad, which is running statewide on radio and has $20,000 behind it, comes a week after a pro-Mourdock super-PAC blasted Rep. Joe DonnellyJoe DonnellyDems struggle with abortion litmus test What prospective college students need to know before they go — or owe Battle begins over Wall Street rules MORE (D-Ind.), Mourdock's opponent, for being a "rubber stamp" for President Obama.

The Hill rates the race a "toss-up."

Listen to the ad: