Voters in Michigan and Arizona are heading to the polls Tuesday for the Republican Primary.

Mitt Romney, Rick Santorum and Ron Paul spent the night in Michigan.

Only candidate Newt Gingrich was not in Michigan on Monday night and has not been actively campaigning in the state.

The polls are showing it is a two-man races between Romney and Santorum.

There are several social media campaigns online urging for Democrats to cross over. Plus, the Santorum campaign confirms it is behind a series of robocalls urging Democrats to come out and vote for Santorum.

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