INDIANAPOLIS — Republican presidential candidate Mitt Romney is plugging Richard Mourdock for Indiana's open seat in the fight for control of the Senate.
In a new ad airing this week, Romney accuses Democratic candidate Joe Donnelly of voting too often with Democratic leaders in Washington. He also calls Mourdock the "51st vote" to repeal the federal health care law.
The spot comes as Mourdock struggles to win the support of moderate Republicans and independent voters in Indiana. Mourdock has underperformed Romney in Indiana by roughly 12 points in most polls taken since he defeated Sen. Richard Lugar in May.
Mourdock and Donnelly increasingly have been calling on star talent in the waning days of the race.
Democrats drew former President Bill Clinton to an Indianapolis rally earlier this month.