Romney said, "We didn't win by a lot, but we won by enough, and that's all that counts."
Santorum conceded before networks called the race.
Santorum said, "Everyone said, 'Well, just ignore, you have really no chance here.' And the people of Michigan looked into the hearts of the candidates, and all I have to say is: I love you back."
Where did Santorum go wrong?
Alice Stirton of Grand Rapids, Michigan said, "I think sometimes he gets bogged down on the theology of things and he needs to talk more the economic issues."
Newt Gingrich came in third in Arizona and last in Michigan, and Ron Paul got half Gingrich's support in Arizona and just 12% in Michigan. Paul says those aren't the numbers that count, the number of delegates is what counts.
Next up is Super Tuesday, it's a big prize with more than 400 delegates up for grabs.