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Sanders, Biden, maintain lead in Iowa: poll

Former Vice President Joe BidenJoe BidenMissouri woman seen with Pelosi sign charged in connection with Capitol riots Facebook temporarily bans ads for weapons accessories following Capitol riots Sasse, in fiery op-ed, says QAnon is destroying GOP MORE and Sen. Bernie SandersBernie SandersSenate Democrats leery of nixing filibuster 'Almost Heaven, West Virginia' — Joe Manchin and a 50-50 Senate Biden to seek minimum wage in COVID-19 proposal 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 ButtigiegOn The Money: Retail sales drop in latest sign of weakening economy | Fast-food workers strike for minimum wage | US officials raise concerns over Mexico's handling of energy permits Buttigieg confirmation hearing slated for Thursday James Murdoch predicts 'a reckoning' for media after Capitol riot MORE maintained his third place spot at 21 percent, a one point decrease from last week. 

Sen. Elizabeth WarrenElizabeth WarrenPorter loses seat on House panel overseeing financial sector OVERNIGHT ENERGY: Nine, including former Michigan governor, charged over Flint water crisis | Regulator finalizes rule forcing banks to serve oil, gun companies | Trump admin adds hurdle to increase efficiency standards for furnaces, water heaters DeVos mulled unilateral student loan forgiveness as COVID-19 wracked economy: memo MORE had a one point increase in support, up to 16 percent. 

Sen. Amy KlobucharAmy KlobucharGoogle completes Fitbit acquisition Hillicon Valley: Fringe social networks boosted after Capitol attack | Planned protests spark fears of violence in Trump's final days | Election security efforts likely to gain ground in Democrat-controlled Congress US Chamber of Commerce to stop supporting some lawmakers following the Capitol riots 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 TrumpFacebook temporarily bans ads for weapons accessories following Capitol riots Sasse, in fiery op-ed, says QAnon is destroying GOP Section 230 worked after the insurrection, but not before: How to regulate social media 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.