(CNN) - Many Democrats have called the prospect of Hillary Clinton and Barack Obama teaming up for the general election a "dream ticket."

But conservative talk radio host Rush Limbaugh said Wednesday a presidential ticket that included a "woman and a black" doesn't "have a prayer."

"Let's say it is Obama and Hillary...Let's put Hillary at the top - That's a position she's familiar with," Limbaugh said on his radio show Thursday. "Therefore, you've got a woman and a black for the first time ever on the Democrat ticket. Ahem. They don't have a prayer."

Donna Brazile, Al Gores former presidential campaign manager, called the comments "un-American."

"I'm an American. And I'm proud to be an American," Brazile said on CNN's The Situation Room Wednesday. "But I think that comment is, as far as I can tell, a very un-American conversation, because African-Americans and women fight for this country. We have died for this country."

"To suggest, somehow or another, that we are not capable of serving this country in the capacity of Commander-in-Chief is just, in my mind, mind-boggling," she continued. "So, with all due respect to Mr. Limbaugh, just wait. Let the people decide. And I guarantee you, the people will make a better decision than Rush Limbaugh."

Limbaugh's comments came hours after Hillary Clinton said the Democratic presidential race could result in a joint ticket.

"That may be where this is headed," she told CBS Wednesday morning. "But of course we have to decide who is on the top of ticket. I think the people of Ohio very clearly said that it should be me."

Obama later called any speculation of teaming up with Clinton "premature."