Last night, bold progressive Tammy Baldwin and Tommy Thompson held a debate over the race for Wisconsin’s U.S. Senate seat. At one point, Baldwin called out Thompson for signing a pledge that he would never vote for a tax increase ai??i?? even on the wealthiest Americans and corporations.

Thompson responded by saying “that’s just a falsehood” and denied ever signing the pledge. Watch it:

The pledge being referenced is Washington lobbyist Grover Norquist’s so-called “Taxpayer Protection Pledge,” which he uses his organization Americans for Tax Reform to enforce (ATR).

Here’s a page from ATR’s website boasting that Thompson had signed the pledge, one that even his tea party primary opponent Eric Hovde had refused to sign.

A quick tip for Thompson: stop deceiving voters about your record. A few days ago, Thompson claimed to not even remember a speech he gave where he said that as a state legislator he would adopt legislation from corporate front group ALEC word for word. Lies like that just aren’t going to withstand scrutiny.

Send Thompson a message. Click here to pitch in a few dollars to support Baldwin.