Update 8:30 p.m.: Romney takes Arizona, leads in Michigan primary
Update 8:30 p.m.
WASHINGTON (AP) -- Mitt Romney coasted to victory in the Arizona primary Tuesday night and vied with rival Rick Santorum for supremacy in Michigan in a Republican presidential race as unsettled as the day it began.
Two other candidates, Newt Gingrich and Ron Paul, made little effort in either state, pointing instead to next week's 10-state collection of Super Tuesday primaries and caucuses.
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