Yeah, it was a really dumb thing to do. Glad he's stepping up:

MIT professor Jonathan Gruber made a lengthy apology for his comments on the "stupidity of the American voter" and the "lack of transparency" during the passage of the Affordable Care Act during a House Oversight Committee hearingTuesday.

He called his comments, revealed in a series of videos, "glib, thoughts and sometimes downright insulting."

"I would like to begin by apologizing sincerely for the offending comments that I have made," Gruber said in his opening statement. "In some cases, I made uninformed and glib comments about the political process behind health care reform. I am not an expert on politics and my tone implied that I was, which is wrong."

"In other cases, I simply made insulting and mean comments that are totally uncalled for in any situation. I sincerely apologize both for conjecturing with a tone of expertise and for doing so in such a disparaging fashion," he continued. "It is never appropriate to try to make oneself seem more important or smarter by demeaning others. I knew better. I know better. I am embarrassed, and I am sorry."