Donnelly found his opening after Mourdock defeated Lugar in May's Republican primary. But he didn't break away until a firestorm erupted over Mourdock's contention during an Oct. 23 debate that a pregnancy resulting from rape is "something God intended."
Outside groups spent millions on the race as Democrats painted Mourdock as an uncompromising tea partyer and Republicans blasted Donnelly for supporting President Barack Obama's federal health care law and other legislation.
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