His evidence for the Thompson claim? A blog post by Feministing which links to a LA Times article which says,
A day after touting his "100% record against abortion," Republican presidential hopeful Fred Thompson said Friday that women should face no criminal penalties for having one during the first three months of pregnancy.I guess one could take that to mean Thompson is in favor of jailing women for having abortions after the first trimester but it certainly doesn't specifically say that and there's no direct quote from Thompson about time frame much less a quote indicating that he'd been in favor of prosecuting women for having abortions after 3 months.
Authorities "can do whatever they want to with abortion doctors, as far as I'm concerned," the former Tennessee senator said. But "if it comes down to giving criminal sanctions to a 19-year-old girl and her mama, I'm against that."
Willis' evidence for the Romney and McCain claim? An article stating that they would have signed the South Dakota law banning abortion. Unfortunately, Willis hasn't taken the time to read the South Dakota law in question. If he did, he would have know the law explicitly states,
"Nothing in this Act may be construed to subject the pregnant mother upon whom any abortion is performed or attempted to any criminal conviction and penalty.