Mitt Romney is the winner of both the Arizona and Michigan primaries.  The Arizona win gives Romney all of the state's 29 delegates.  In Michigan, 30 delegates are handed out based on the winner of individual Congressional districts (two delegates for each of 14 districts, plus two bonus delegates for the overall vote leaders).  Some of those Michigan delegates will be going to Rick Santorum, who finished second in both states.  Ron Paul finished third in Michigan, fourth in Arizona, splitting places with Newt Gingrich (third in Arizona, fourth in Michigan).

FOX News Radio's Jennifer Keiper and Jeff Monosso report:

From America's Election Headquarters, I'm Jennifer Keiper in Michigan.

With his wife and one of his sons by his side, Mitt Romney tells a packed room of supporters here in Novi...

(Romney) "Thank you Michigan. What a win. This is a big night. Thanks, you guys."

Mitt Romney wins the state where he grew up and his father was Governor and promises to get people back to work, create less debt and smaller government, and get the country "back on track."

(Santorum) "A month ago they didn't know who we are - but they do now."

Rick Santorum didn't win Arizona and after waging a hard fought battle for the Great Lakes State, he didn't pull off the upset he had hoped for here.

Even despite help from Democratic voters, who also showed up at the polls, but his campaign tells us they still captured momentum going into Super Tuesday next week.

At Santorum Headquarters in Grand Rapids, Jeff Monosso, FOX News Radio.

Romney thanked his supporters at his headquarters in Novi, MI:

Santorum addressed his supporters in Grand Rapids, Michigan.  Despite it being Romney's "native state" (though he was Governor of Massachusetts, Romney was born in - and his father was a popular governor in - Michigan).

Santorum thanked his supporters, noting he gathered momentum that made Michigan a close race: