Iowa Democrats Stick With Hillary Clinton in Bloomberg Politics/Des Moines Register Poll

Bernie Sanders has quickly risen as Elizabeth Warren's proxy for the anti-establishment alternative.

Hillary Clinton, former secretary of state and U.S. presidential candidate, speaks to reporters following a small business roundtable discussion at Bike Tech in Cedar Falls, Iowa, U.S., on Tuesday, May 19, 2015.

Photographer: Daniel Acker/Bloomberg
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Hillary Clinton remains the overwhelming favorite among Iowa Democrats looking ahead to next year's presidential caucuses, though Bernie Sanders has quickly risen as Elizabeth Warren's proxy for the anti-establishment alternative.

Clinton is the first choice for 57 percent of likely Democratic caucus-goers in a new Bloomberg Politics/Des Moines Register Iowa Poll conducted May 25-29, up a percentage point from the previous poll in January. Controversies dating from her tenure as secretary of state, from her handling of the Benghazi attacks and her use of private e-mail to the Clinton Foundation's acceptance of contributions from foreign governments, have not weakened her campaign in Iowa, though many Democrats remain concerned they could hurt her in a general election.