Biden remains dominant over Dems nationwide

A new national poll finds former Vice President Joe Biden holding a comfortable lead over the rest of the Democratic field, but a separate survey of early voting states shows a closer contest between Biden and his two top progressive challengers.

Biden continues to lead in the race with 27% among Democrats and Democrat-leaning independents, according to an["ad-manager-58815"]= {"custom_css":[],"ad_details":[{"min_width":"","max_width":"","dfp_ad_sizes":[{"dfp_ad_width":"300","dfp_ad_height":"250"}]}],"ad_id":58815,"ad_container":"div-ad-manager-58815","ad_placement":"in-article","ad_name":"ad-manager-58815","position":"in_article","article_position":1,"out_of_page_ad":null,"lazyload":"global"};

The ABC News/Washington Post poll was conducted by phone from September 2 to September 5 in English and Spanish among a random national sample of 1,003 adults. The results have a margin of sampling error of 5.5 points, including a sample of 437 Democrats and Democratic-leaning independents.

The CBS News and YouGov survey was conducted from August 28 to September 4 among a sample of 16,525 registered voters from 18 states that will hold primaries or caucuses in February and early March: Alabama, Arkansas, California, Colorado, Iowa, Maine, Massachusetts, Minnesota, Nevada, New Hampshire, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Utah, Vermont and Virginia. The sample includes 7,804 self-identified Democrats and Democratic-leaning independents and the combined results have a margin of error of plus or minus 1.8 points.

CNN’s Jennifer Agiesta contributed to this report.