A British bookmaker on Friday announced that 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.) had overtaken 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 as the favorite to win the 2020 Democratic primary.

The bookmaker Ladbrokes said in a tweet that Warren was the 9/4 favorite in their book and was trailed by Biden at 11/4. Sens. 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.) and 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.) were tied for third with 6/1 odds and 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 was fifth with 12/1 odds.

Elizabeth Warren now favourite to win 2020 Democratic nomination. pic.twitter.com/JILmFmm1Zn — Ladbrokes Politics (@LadPolitics) August 16, 2019

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"It looks like the betting market is going a little cold on Biden despite his general lead in the polls," Matthew Shaddick, Ladbrokes's head of political betting, told Newsweek. "Warren seemed to get a boost after the last set of debates and, in particular, seems to be performing well in Iowa."

Biden has consistently been the front-runner in most major Democratic primary polls. Warren's campaign, however, has seen increased momentum in recent months. Warren, Harris and Sanders typically poll near the top of the field of nearly two dozen candidates.