A bitter and often personal debate behind them, Republicans Rick Santorum and Mitt Romney are shoring up their campaigns in different ways ahead of a series of crucial presidential primaries.
Romney is paying more attention to Michigan, his birthplace and the site of an unexpectedly tight race with Santorum, by attending a tea party rally Thursday night in an effort to get more conservative support.
Santorum is focusing for the moment on raising money for his cash-strapped operation. He is hoping for an upset in Michigan, which would cap a rebound that began two weeks ago with victories in three states.
The 20th debate of the primary season offered the GOP hopefuls their final face-to-face outing before contests over the next 12 days that may well winnow the field.
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