Hillary Clinton and Bernie Sanders have clashed over Wall Street and foreign policy, in the Democratic presidential candidates' first one-on-one debate.
Clinton cast him as an idealist who will not get things done and Sanders accused her of being too tied to the establishment to achieve real change.
The TV debate in New Hampshire was their first since the Democratic race was whittled down to two this week, BBC reported.
Without a third person on stage, the policy differences were laid bare.
The former secretary of state said Sanders' proposals such as universal healthcare were too costly and unachievable.
And she went after her rival aggressively over his attempts to portray her as being in the pocket of Wall Street because of the campaign donations and the fees she had received for after-dinner speeches.
"It's time to end the very artful smear that you and your campaign have been carrying out," she said.
Sanders, a senator of Vermont, used a favorite attack line against her that she backed the Iraq War, but she questioned his foreign policy expertise.
The debate comes five days before the second state-by-state contest in the battle for the presidential nominee, in New Hampshire on Tuesday.
Despite the tensions over policies, the debate ended on a warm note, when Clinton said the first person she would call would be Sanders, if she won the nomination.
