Meanwhile, Michigan winner Mitt Romney got into a heated exchanged with an Associated Press reporter after Romney claimed he doesn’t have lobbyists running his campaign.

Mitt Romney: “I don’t have lobbyists running my campaign. I don’t have lobbyists that are tied to my …”

Reporter: “That’s not true governor. That is not true. Ron Kaufman is a lobbyist.”

Romney: “Did you hear what I said? Did you hear what I said, Glen? I said I don’t have lobbyists running my campaign, and he’s not running my campaign.”

Reporter: “He’s a senior adviser.”

Romney: “He’s an adviser. And the person who runs my campaign is [campaign manager] Beth Myers, and I have a whole staff of deputy campaign managers.”

Reporter: “Has Beth Myers been on the plane with you?”

Romney: “Beth Myers has been the plane with me, and Beth Myers is running my campaign… Ron is a wonderful friend and adviser. He’s not paid — he’s an adviser, like many others. But I do not have lobbyists running my campaign.”

The Romney adviser is Ron Kaufman, a senior strategist who often travels in Romney’s entourage. He is a lobbyist with the firm Dutko Worldwide.