Story highlights Bernie Sanders beats Donald Trump by 15 points -- 54% to 39%

Clinton beats Sanders among voters who want an experienced candidate 71% to 30%

Washington (CNN) Hillary Clinton is leading Bernie Sanders nationwide by a crushing 25-point margin, though Sanders bests Clinton in a hypothetical general election match-up against GOP front-runner Donald Trump, two polls released Sunday by NBC News/Wall Street Journal have found.

The former secretary of state received 59% support from Democratic primary voters, while 34% support the Vermont senator. Former Maryland Gov. Martin O'Malley received 2% support.

The poll, released with a little more than two weeks to go before the first votes are cast in Iowa, also finds 79% of Democratic primary voters saying they could see themselves supporting Clinton, compared to 66% saying the same about Sanders.

Sanders, however, beats Clinton among voters who want a candidate who will bring change to current policies, 63% to 26%. But Clinton tops Sanders among voters who want experience and a "tested" candidate, 71% to 30%.

Overall, 61% of all voters -- including Democrats, Republicans and independents -- want a candidate who represents change, while 36% prefer experience.

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