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MANCHESTER, NH - SEPTEMBER 19:  Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena.  (Photo by Scott Eisen/Getty Images)

DAVIE, FL - OCTOBER 02:  Democratic presidential candidate Hillary Clinton laughs as she is introduced during her campaign stop at the Broward College à Hugh Adams Central Campus on October 2, 2015 in Davie, Florida.  Hillary Clinton continues to campaign for the nomination of the Democratic Party as their presidential candidate.  (Photo by Joe Raedle/Getty Images)
MANCHESTER, NH - SEPTEMBER 19:  Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena.  (Photo by Scott Eisen/Getty Images)

DAVIE, FL - OCTOBER 02:  Democratic presidential candidate Hillary Clinton laughs as she is introduced during her campaign stop at the Broward College à Hugh Adams Central Campus on October 2, 2015 in Davie, Florida.  Hillary Clinton continues to campaign for the nomination of the Democratic Party as their presidential candidate.  (Photo by Joe Raedle/Getty Images)

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    Clinton holds 18-point lead over Sanders in Iowa

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Clinton holds 18-point lead over Sanders in Iowa

Hillary Clinton holds an 18-point lead over Bernie Sanders in Iowa, with her lead resting on a wide gender gap and support among older Iowans, a new poll shows.

Clinton holds 18-point lead over Sanders in Iowa

Hillary Clinton holds an 18-point lead over Bernie Sanders in Iowa, with her lead resting on a wide gender gap and support among older Iowans, a new poll shows.