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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 DonnellyRand's reversal advances Pompeo Overnight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit Pompeo headed for confirmation after surprise panel vote 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: