Mitt Romney gets enough delegates, in some counts, to go over the top in his bid for the GOP nomination. But his celebration gets distracted by more Donald Trump "birtherism." Plus, the Texas GOP goes into overtime to find a Senate nominee, Rep. Thad McCotter plans a write-in campaign in Michigan in hopes of keeping his own job, and a look ahead to the Wisconsin recall.
NPR's Ken Rudin and Ron Elving have the latest political news in this week's roundup.
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