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 / Updated  / Source: NBC News

Fifty-six percent of Democratic primary voters say they're not concerned about the need for the party to find someone to challenge frontrunner Hillary Clinton for the Democratic nomination, according to a new NBC News/Wall Street Journal poll.

That percentage is down five points since the March 2015 NBC/WSJ poll.

By contrast, 43 percent in the current survey prefer that Democrats find a challenger for Clinton – up from 38 percent who said this back in March.

These poll numbers come as Clinton last week received her first official challenger in Sen. Bernie Sanders, I-Vt. Other potential Democratic opponents include former Maryland Gov. Martin O'Malley, former Rhode Island Gov. Lincoln Chafee and former Sen. Jim Webb, D-Va.

The NBC/WSJ poll was conducted April 26-30 of 273 Democratic primary voters, and it has a margin of error of plus-minus 5.9 percentage points.