Arizona and Michigan voters cast their primary ballots

POSTED: Tuesday, February 28, 2012 - 2:00pm

UPDATED: Tuesday, February 28, 2012 - 2:04pm

Today could be a game changer in the Republican race for president.

Michigan and Arizona vote today.

Arizona looks like a sure win for Mitt Romney, but his home state of Michigan is another story.

If he loses to Rick Santorum there, we could be looking at a real fight into late spring, early summer, or even the convention in August.

The candidates are already looking forward to Super Tuesday, and Ohio.

Santorum will campaign there today before returning to Michigan for tonight's poll results.

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