As predicted, Mitt Romney has won the Arizona primary. From the New York Times: Mitt Romney has won the Republican presidential primary in Arizona, based on preliminary exit polling, but is locked in a tight battle with Rick Santorum in Michigan, a crucial electoral battleground where Mr. Romney's home-town advantage has all-but evaporated. Mr. Romney's victory in Arizona will earn him 29 delegates, extending the lead he already enjoys over his rivals. The win comes after his rivals largely conceded that the former Massachusetts governor would win the border state. The race is Michigan, also as predicted, is neck and neck.