"It could be massive. We're both looking for something to do, right?"
The Clinton campaign declared victory earlier in the night, though there is no clear winner.
The outcome of the caucuses could hinge on who O’Malley’s supporters move to.
The Democratic race for Iowa is headed down to the wire.
MSNBC and the New Hampshire Union Leader are seeking to host a debate next week.
Iowa's caucuses are one week from Monday.
Donald Trump gained more followers during the debate than Clinton or O'Malley.
Data shows that was the most asked question about any candidate.
O'Malley's campaign is calling the probe a "bogus political attack."
O'Malley criticized No Labels for calling Trump a "problem solver."
Martin O'Malley could miss the cut for January's NBC News-YouTube Democratic debate.
He panned Cruz for his stance on guns, calling the Texas senator "outrageous."
O'Malley's March performs on March 13 following his unsuccessful Oval Office bid.
"[It] says a lot about the loyalty that he inspires," a spokeswoman said.
Generation Forward PAC received the donations for O'Malley's Democratic White House run.
The DNC has refused to sanction a new debate in New Hampshire just before its primary.
Sanders has also attacked Clinton as not going far enough on climate.
The new CBS News "Battleground Tracker" poll shows a slim lead for Sanders.
Clinton and Sanders tangle in final clash before first votes will be cast.
Sanders notes $600,000 in Clinton speaking fees.
Fusion hosts Iowa Brown and Black Presidential Forum on Monday.
“People should go home so we can get on with this thing, right?”
Ohio's secretary of state office said there was no way to appeal.
The Democratic hopeful failed to get the 1,000 required signatures.