“I like Mitt Romney as a person. I think he's a dignified person. But I have no common ground on economics. He doesn't worry about the Federal Reserve. He doesn't worry about foreign policy. He doesn't talk about civil liberties, so I would have a hard time to expect him to ever invite me to campaign with him.”

American author, activist, medical doctor, and former politician

Ron Paul is an American author, activist, medical doctor, and former politician. He served in the U.S. House of Representatives for Texas in two stretches, from 1976 to 1977 and from 1979 to 1985, and again from 1997 to 2013. He is known for a long public career that moved between medicine and politics, and for three presidential runs. He was the Libertarian Party nominee in 1988, then sought the Republican nomination in 2008 and 2012.