Mourdock's campaign was roiled over controversy surrounding his recent explanation for why he opposes abortion for rape victims. But the initial reason he was facing such a tough race from Donnelly involved his earlier comments opposing bipartisanship and some of the more conservative statements the Tea Party favorite had made during his primary win over Sen. Dick Lugar (R-Ind.).
The ad seeks to tie many of them together in one spot. The two were locked in a tight race before Mourdock's comments last week, and there has been no reputable nonpartisan polling since then.
The Democratic Senatorial Campaign Committee has released a poll showing Donnelly with a 7-point lead, while Mourdock released an internal poll showing the race tied.