Republican Mitt Romney is standing behind Indiana Senate hopeful Richard Mourdock as President Barack Obama's campaign keeps up criticism of Romney's ties to a candidate who said pregnancies that result from rape are "something God intended." Romney's campaign has said he disagreed with Mourdock's remark, which came in a debate Tuesday with his opponent, Rep. Joe Donnelly. But Romney is standing by his endorsement of Mourdock - and not asking the Indiana state treasurer to take down an ad Romney filmed Monday in support.