Ari Shapiro

In a final burst of campaigning in Michigan on Tuesday, embattled GOP front-runner Mitt Romney complained that rival Rick Santorum was making automated phone calls to Democrats and urging them to vote against Romney in the Republican race. (Although only declared Republicans can vote in the party primary, voters can change their affiliation to cast a ballot.)

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RACHEL MARTIN, HOST:

This is WEEKEND EDITION, from NPR News. I'm Rachel Martin.

Mitt Romney is on a bus tour across Michigan, hoping to win the votes of the state where he grew up. With primary day on Tuesday, Romney seems to have closed the gap in polls with Rick Santorum.

This trip has the feel of those early days campaigning back in New Hampshire, before any votes were actually cast: the long bus rides, the snowy landscape, even the impromptu restaurant drop-ins.

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