Carson is demanding Cruz discipline campaign staffers who started the rumors.
Clinton has been seeking to shore up the black vote in her fight against Sanders.
"He’s had four big bankruptcies," said John Sununu.
"Bernie Sanders is so clearly a fringe candidate," the Fox News reporter added.
The former Texas lawmaker also praised Bernie Sanders for hitting "cronyism on Wall Street."
Sanders has 54 percent support, with Clinton at 39 percent.
Devin Henry 02/05/16 12:52 PM EST
“No future extraction. I agree with that," Clinton told greens after Thursday's debate.
The episode is being hosted by Sanders impersonator Larry David.
But Donald Trump still leads Marco Rubio by 10 percentage points.