Ratcheting up the rancor, Hillary Clinton and Bernie Sanders tangled aggressively in a Democratic presidential debate Sunday night over trade, Wall Street influence and more, with Clinton accusing him of turning his back on the auto industry and Sanders countering that Clinton's friends on Wall Street had "destroyed this economy."

It was a marked change in tone for the two Democrats, signaling Sanders' increasingly difficult effort to slow the party's front-runner. Both candidates frequently interrupted one another and accused each other of misrepresenting their records.

"Let's have some facts instead of some rhetoric for a change," Clinton snapped at Sanders at one point.

"Let me tell my story, you tell yours," Sanders shot back at another. "Your story is voting for every disastrous trade amendment and voting for corporate America."

More than once, Sanders chafed at Clinton's interruptions, saying, "Excuse me, I'm talking" or "Let me finish, please."

Their disagreements were clear, but still the debate's tone was nothing like that of the Republican debate in Detroit just three days earlier, a four-way faceoff that was marked by a steady stream of personal attacks, insults and even sexual innuendo. The Democrats' faceoff, in comparison, was a more civil if heated affair.

Clinton said that while she and Sanders have their differences on policy, "compare the substance of this debate with what you saw on the Republican stage last week."

On a related note, Sanders was declared the winner Sunday in the Maine Caucus.  He now has won a total of eight states.

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