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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 DonnellyJoseph (Joe) Simon DonnellyActress Marcia Gay Harden urges Congress to boost Alzheimer's funding Manchin becomes final Democrat to back bill preventing separation of immigrant families Dems seek to leverage ObamaCare fight for midterms 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: