Sanders, Biden, maintain lead in Iowa: poll

Former Vice President Joe BidenJoe BidenGOP eyes booting Democrats from seats if House flips Five House members meet with Taiwanese president despite Chinese objections Sunday shows preview: New COVID-19 variant emerges; supply chain issues and inflation persist MORE and Sen. Bernie SandersBernie SandersFive ways Senate could change Biden's spending plan Poll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Bernie Sanders' ex-spokesperson apprehensive over effectiveness of SALT deductions 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 ButtigiegAdvocates see pilot program to address inequalities from highways as crucial first step Poll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Five reasons for Biden, GOP to be thankful this season MORE maintained his third place spot at 21 percent, a one point decrease from last week. 

Sen. Elizabeth WarrenElizabeth WarrenPoll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Biden eyes new path for Fed despite Powell pick Equilibrium/Sustainability — Presented by Southern Company — Storms a growing danger for East Coast MORE had a one point increase in support, up to 16 percent. 

Sen. Amy KlobucharAmy KlobucharSunday shows preview: New COVID-19 variant emerges; supply chain issues and inflation persist The Hill's 12:30 Report: Biden renominates Powell as Fed chair Senate Democrats look to fix ugly polling numbers 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 TrumpStowaway found in landing gear of plane after flight from Guatemala to Miami Kushner looking to Middle East for investors in new firm: report GOP eyes booting Democrats from seats if House flips 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.