New poll shows four top-tier 2020 candidates in Iowa

 New poll shows four top-tier 2020 candidates in Iowa
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Iowa voters appear split on the 2020 Democratic presidential primary, according to a new poll that places four candidates within the margin of error for the top spot in the field. 

Former Vice President Joe BidenJoe BidenRussia says 24 diplomats asked by U.S. to leave by September Biden discusses Canadian citizens detained in China with Trudeau Biden administration to keep Trump-era rule of turning away migrants during pandemic MORE and Sen. Bernie SandersBernie SandersFive things to watch in two Ohio special election primaries This week: Senate starts infrastructure sprint Senators introduce bipartisan infrastructure bill in rare Sunday session MORE (I-Vt.) are leading the primary field in the first-in-the country caucus state with 22 percent support each, according to a CBS News-YouGov poll released Sunday. 

South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegSunday shows - Delta variant, infrastructure dominate Sunday shows preview: Delta concerns prompt CDC mask update; bipartisan infrastructure bill to face challenges in Senate Chasten Buttigieg: DC 'almost unaffordable' MORE closely trails at 21 percent, and Sen. Elizabeth WarrenElizabeth WarrenAmerica's middle class is getting hooked on government cash — and Democrats aren't done yet California Democrats warn of low turnout in recall election Pelosi disputes Biden's power to forgive student loans MORE’s (D-Mass.) 18 percent also falls within the 4.1 percent margin of error, placing the four candidates in a statistical dead heat for the top spot in Iowa.

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No other candidate registered double-digit support, with Sens. Kamala HarrisKamala HarrisMeghan McCain predicts DeSantis would put Harris 'in the ground' in 2024 matchup Honeymoon's over: Biden's record may have Americans demanding a divorce The Hill's 12:30 Report - Presented by Facebook - CDC equates Delta to chickenpox in contagiousness MORE (D-Calif.) and Amy KlobucharAmy KlobucharManchin 'can't imagine' supporting change to filibuster for voting rights Hillicon Valley: Democrats urge tech CEOs to combat Spanish disinformation | Amazon fined 6M by EU regulators Democrats urge tech CEOs to combat Spanish disinformation MORE (D-Minn.) tied in a distant fifth place with 5 percent each.  

Buttigieg has seen a 15-point uptick since a CBS-YouGov poll of Iowa voters in September that placed him at 6 percent support. 

Sanders’s support has increased 3 points since September, while Warren has seen a 10-point dip and Biden’s support has decreased 3 points in Iowa. 

Buttigieg saw a similar surge in a CNN poll released Saturday that placed him at him at 25 percent support, leading Sanders and Biden by 10 points and Warren by 9 points. 

The new CBS-YouGov poll surveyed 856 registered Democratic voters and was conducted between Nov. 6 and Nov. 13.