'Too close to call' in Michigan; Romney wins Arizona

The GOP primary race in Michigan, Mitt Romney's home state, is "too close to call," NBC News projects.

Polls in the run up to Michigan have shown a tight race between Romney and Rick Santorum.

NBC News does project, however, Romney to be the winner in Arizona.

Since Arizona is winner-take-all, Romney will win all 29 of the state's delegates.

Interesting fact: Despite the -- warranted -- focus on Michigan over Arizona, Romney will actually win more delegates out of Arizona than Michigan, no matter the outcome, because Michigan is winner-take-all by congressional district.