"What I learned about myself is when things get tough you put your head down, you work very hard, you do the job necessary to get your message out there and, if you succeed so much the better," he told me on "GMA."
Romney didn't pay attention to the ups and downs of his campaign, he said, adding that it's "not the end of the world" if people don't support him.
"I have a good life with my family and my wife. I don't have to win, I just want to win and I want to win because I care about my country," he said.
"It was a chance to see both of us, to talk about our respective visions for the future, the country, and fortunately I was able to connect with the people here and get the kind of support I needed," he said. "I understand that I was able to get more votes here in Florida than has ever been accomplished here before, so I'm feeling pretty good this morning."
"Well I think what you're seeing now from Speaker Gingrich is just a precursor of what you'll see from President Obama. Perhaps what we're getting now inoculates us, or at least prepares us, for what will come down the road," Romney said. "No question that Barack Obama's billion dollar machine will organize the most vitriolic, spiteful campaign in American history and we're going to have to be ready for that."
Every Republican who has won the Florida primary has gone onto clinch the nomination. So can anything stop Romney?
"Well I'm sure Speaker Gingrich and Rick Santorum and Ron Paul have some ideas. But I'm feeling pretty good today, obviously," he said.