The Democratic presidential primary contest in Colorado is neck and neck, with Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) edging out former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE by less than 1 point, according to a new Emerson poll released Tuesday.

Sanders, who won Colorado’s Democratic caucuses in 2016, tops the field with 26 percent support among Democratic primary voters in Colorado, the survey found, while Biden trails closely behind with 25 percent. Sen Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) scored a close third, receiving 20 percent support in the poll.

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In fourth place is Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), who notched 13 percent in the Emerson poll. South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE rounds out the top five candidates with 5 percent support in the Centennial State.

Among 18- to 29-year-olds, Sanders has the most significant support, scoring 42 percent support among the demographic. But he also performed well among 30- to 49-year-olds, 34 percent of whom pointed to the Vermont senator as their top choice.

Biden saw his best results among those over age 65, taking 43 percent support.

Sanders also appears to be holding on to many of the primary voters who cast their ballots for him in the 2016 Democratic nominating contest. Fifty-three percent of those voters said they still support him in the 2020 contest, while 24 percent now say they back Warren, 9 percent support Biden and 3 percent are with Harris.

Among those who voted for Clinton in the 2016 Colorado primary, however, 45 percent are now backing Biden. Warren takes second among those voters with 21 percent support, while 14 percent back Harris and 4 percent support Sanders, the Emerson poll found.

Still, those outcomes could change in the coming months. Voting in the state is more than six months away, and 64 percent of the Democratic respondents to the Emerson survey said there’s still a chance that they could change their candidate preference ahead of the primary.

The nominating contest in Colorado is also set to undergo a major change in 2020. The state will hold a primary instead of a caucus for the first time in more than a decade, a development stemming from a 2016 vote to abandon the caucus system and allow all voters to participate in party primaries.

The Emerson poll surveyed 403 Democratic primary voters in Colorado from Aug. 16 to 19. It has a margin of error of plus or minus 4.8 percentage points.