On the Republican front, Mitt Romney has shifted the tone of his campaign and is now presenting himself as an agent of change. He has repeatedly questioned whether Senator John McCain could beat Barack Obama in November.

Mitt Romney: “This is going to be a time of choice for our party. Are we going to have someone as a nominee who can stand up to Barrack Obama, who I think could very well be their nominee? He’ll stand up and talk about change. He hasn’t ever done it, but he’ll talk about change, and he’ll be able to stand up, as he has right now against long-serving U.S. senators who talk about their experience, and he just blows them away.”