David Barton is a strange fellow, who has built is reputation on the dubious platform of telling lies about the Founding Fathers -- as well as the more conservative-friendly strategy of bashing college professors. (Hey, it was how William F. Buckley and Dinesh D'Souza got started.)
Apparently, some college professors are fighting back. Not the relativist /deconstructionist/ poststructuralist types against whom Barton fulminates, but rather a pair from Grove City College, a Christian school conservative enough that its mission statement explicitly rejects "secularism and relativism."
Warren Throckmorton and Michael Coulter have recently published Getting Jefferson Right: Fact Checking Claims About Our Third President. Here's a review by RD's Paul Harvey; here's a link to the book. Here is Throckmorton and Coulter's website.
Our own life has been blessedly unimpaired by the likes of Barton; we like our history reality-based, and so do most of the people around us. But if you've had to deal with this guy's acolytes, you may want to check out Throckmorton and Coulter.