MORE VIDEO: AFP & SEIU Debate Healthcare

Americans for Prosperity's Carl Bearden says that there's no way to go back and get rid of Medicare, but said expanding government health care further is a mistake that should be avoided.

"Had we had the luxury of going back in a time machine and never having done Medicare the way it was done, I think that would've been a better way to go about it," he said, referring to private insurance. "We're not going back, but that doesn't repeat the mistake going forward."

*WATCH FULL CLIP ABOVE*

Bets that a government plan would put most private insurance out of business within 7 to 12 years.

Adds: "On a public plan, you're not going to have a lot of choices."

SEIU: CARNAHAN DOESN'T HAVE TO HAVE POSITION

SEIU's Clark Brown said a public option is a must in order to insure the more than 40 million without coverage.

Brown also said he doesn't think Democratic U.S. Senate candidate Robin Carnahan needs to put out a clear position on the healthcare debate.

"I don't know that clearly I believe she has to take a formal position . . ."

*WATCH FULL GIVE & TAKE ABOVE*