Poll: Clinton clear winner of second debate
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Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonGOP struggles with retirement wave Overnight Energy: Trump to revoke California's tailpipe waiver | Democrats propose bill to revoke Trump endangered species rollback | Trump officials finalize rule allowing fewer inspectors at pork plants Mark Mellman: The most important moment in history? MORE easily won the second Democratic presidential debate, according to a poll published late Saturday.

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Sixty seven percent of Democratic primary voters said Clinton won the debate, Public Policy Polling (PPP) found in its survey, conducted for the pro-Clinton super-PAC Correct The Record. Twenty percent thought Sen. Bernie SandersBernie SandersJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE (I- Vt.) won the debate, PPP added, while 7 percent picked former Maryland Gov. Martin O’Malley as the winner.

Sixty three percent of viewers also said they had a more positive opinion of Clinton after the debate, according to PPP. Forty one percent said the debate gave them a more positive opinion of Sanders and 37 percent said they now have a more positive opinion of O’Malley.

The left-leaning polling firm found that Clinton is the clear favorite of Democrats when it comes to national security, a key focus in Saturday night’s debate, with 75 percent of respondents saying she’s the strongest candidate on that topic. Seventeen percent said the same about Sanders while 5 percent chose O’Malley.

PPP’s poll of 510 Democratic primary voters has a 4.3 percent margin of error.

--This report was updated at 9:09 a.m.