Fred Thompson has better positions than Romney on spending, taxes, illegal immigration, national security, health care, gun control, and the role of the federal government. Why should we give Romney a pass if we don't like his record and don't think he's the best candidate?
Besides, Hillary doesn't need our help to beat Romney. In case you haven't noticed,
48% of voters have said they'd "definitely vote against" Mitt Romney in the general election.
If you believe polls so much, why don’t you admit that Thompson has zero chance then?
Thompson’s actual record (as opposed to talk) is pretty awful (CFR is the only piece of legislation he authored).