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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 DonnellyNo room for amnesty in our government spending bill Senate confirms Larsen to federal appeals court Senate confirms controversial Trump nominee to appeals court 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: