Sanders, Biden, maintain lead in Iowa: poll

Former Vice President Joe BidenJoe BidenThe Hill's Campaign Report: Biden struggles to stay in the spotlight Is Texas learning to love ObamaCare? Romney warns Trump: Don't interfere with coronavirus relief oversight MORE and Sen. Bernie SandersBernie SandersOvernight Energy: Oil giants meet with Trump at White House | Interior extends tenure of controversial land management chief | Oil prices tick up on hopes of Russia-Saudi deal Oil giants meet at White House amid talk of buying strategic reserves The Hill's Campaign Report: Biden struggles to stay in the spotlight MORE (I-Vt.) sit atop the Democratic presidential field in Iowa just one day before the first-in-the-nation caucuses, according to a new poll. 

Biden and Sanders are tied at 25 percent as the first choice nominee among likely caucusgoers, according to a CBS News poll conducted by YouGov released Sunday. 

The results largely match the CBS News poll released last week, which showed the two top candidates in the lead in the state, with Sanders holding a slight 1-point lead over Biden, within the poll’s margin of error, at 26 percent to 25 percent. 

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Former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegButtigieg launches new PAC to aid down-ballot candidates HuffPost political reporter on why Bernie fell way behind Biden Economists fear slow pace of testing will prolong recession MORE maintained his third place spot at 21 percent, a one point decrease from last week. 

Sen. Elizabeth WarrenElizabeth WarrenOvernight Health Care: CDC recommends face coverings in public | Resistance to social distancing sparks new worries | Controversy over change of national stockpile definition | McConnell signals fourth coronavirus bill Democratic senators want probe into change of national stockpile description Democrats ask EPA, Interior to pause rulemaking amid coronavirus MORE had a one point increase in support, up to 16 percent. 

Sen. Amy KlobucharAmy KlobucharDemocrats fear coronavirus impact on November turnout Hillicon Valley: Zoom draws new scrutiny amid virus fallout | Dems step up push for mail-in voting | Google to lift ban on political ads referencing coronavirus Democrats press Trump, GOP for funding for mail-in ballots MORE (D-Minn.) had a 2 point decrease, down to 5 percent support. No other candidates registered more than 5 percent. 

Three of the top candidates, Sanders, Warren and Klobuchar, will miss the key event as they’re held up in Washington, D.C., as President TrumpDonald John TrumpTrump fires intelligence community inspector general who flagged Ukraine whistleblower complaint Trump organization has laid off over 1000 employees due to pandemic: report Trump invokes Defense Production Act to prevent export of surgical masks, gloves MORE’s Senate impeachment trial presses on. A vote will be held Wednesday and the president will likely be acquitted in the GOP-controlled Senate. 

The poll surveyed 2,500 registered voters in Iowa, including 1,401 self-identified Democrats as well as registered voters who lean Democrat or plan to participate in the Democratic caucus this year. The survey was conducted between Jan. 22 and 31. The margin of error is 3.9 points in Iowa.