Why not?
It was Romney that planted that false story to "The Politico" on the day of the Iowa Caucus that Thompson was quitting the race.
It was the sleaziest of sleaze by Romney. Thompson told a reporter it cost him at least 3% in Iowa.
The Clinton's could learn some great sleaze from Romney's book.
Got any proof of that? I didn't think so. If you actually read the Politico piece, you would see that it cited those in Thompson's campaign making the claim. It went further to speculate that Thompson would then endorse McCain.
I can appreciate fervor for your candidate, but it doesn't mean you have to lie about soneone elses.