Sanders, Biden, maintain lead in Iowa: poll

Former Vice President Joe BidenJoe BidenDonald Trump and Joe Biden create different narratives for the election Poll: Biden widens lead over Trump to 10 points Biden: 'We are a nation in pain, but we must not allow this pain to destroy us' MORE and Sen. Bernie SandersBernie SandersExpanding tax credit for businesses retaining workers gains bipartisan support The battle of two Cubas Coronavirus Report: The Hill's Steve Clemons interviews Rep. Ro Khanna 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 ButtigiegBiden hopes to pick VP by Aug. 1 It's as if a Trump operative infiltrated the Democratic primary process Here's how Biden can win over the minority vote and the Rust Belt MORE maintained his third place spot at 21 percent, a one point decrease from last week. 

Sen. Elizabeth WarrenElizabeth WarrenThe Memo: Trump ratchets up Twitter turmoil Hillicon Valley: Twitter flags Trump tweet for 'glorifying violence' | Cruz calls for criminal investigation into Twitter over alleged sanctions violations | Senators urge FTC to investigate TikTok child privacy issues Warren condemns 'horrific' Trump tweet on Minneapolis protests, other senators chime in MORE had a one point increase in support, up to 16 percent. 

Sen. Amy KlobucharAmy KlobucharLiberal group asks Klobuchar to remove herself from VP consideration because of prosecutorial record Klobuchar on defense as Floyd death puts spotlight on record Officer involved in George Floyd death charged with third-degree murder and manslaughter 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 TrumpDonald Trump and Joe Biden create different narratives for the election The hollowing out of the CDC Poll: Biden widens lead over Trump to 10 points 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.