The three leading Democratic presidential candidates are cementing their lead over the pack less than 100 days before the first-in-the-nation Iowa caucuses, with Sens. Elizabeth Warren (D-Mass.) and Bernie Sanders (I-Vt.) edging close to the leader, former Vice President Joe Biden, according to a Washington Post-ABC News poll released Sunday. Among the Democratic-leaning registered voters surveyed, Biden, rated by respondents as the most likely to beat President Trump, had the support of 28 percent, trailed by Warren with 23 percent and Sanders with 17 percent. Warren has risen from 12 percent in July and 18 percent in September, and now trails Biden by less than the poll's margin of error. The only other candidate polling above 2 percent was South Bend, Indiana, Mayor Pete Buttigieg, who stands out in fourth place with the support of 9 percent of those polled.

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