Even "Factcheck.org" thinks that Dems have gone too far in misrepresenting Republican FairTax proposals

Dems have tried to sell the FairTax as a Republican tax increase. The site has some copies of the ads.

This line of attack has emerged as a major Democratic theme. We counted at least 33 TV spots since August that make this claim, and it’s being repeated in an unknown number of mailers and in ads running on radio or local cable channels, which we cannot monitor. . . .
But the Democratic attacks omit all those subtleties and simply strive to create the impression that the new sales tax would come on top of all existing taxes. And that’s not the case.