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 BidenSenate gears up for battle over witnesses in impeachment trial Conservative group hits White House with billboard ads: 'What is Trump hiding?' Democrat representing Pennsylvania district Trump carried plans to vote to impeach  MORE and Sen. Bernie SandersBernie SandersSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Biden hires Clinton, O'Rourke alum as campaign's digital director 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 ButtigiegPeter (Pete) Paul ButtigiegSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' Biden hires Clinton, O'Rourke alum as campaign's digital director Trump neck and neck with top 2020 Democrats in Wisconsin: poll MORE closely trails at 21 percent, and Sen. Elizabeth WarrenElizabeth Ann WarrenSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' On The Money: Lawmakers strike spending deal | US, China reach limited trade deal ahead of tariff deadline | Lighthizer fails to quell GOP angst over new NAFTA Bill Weld: As many as six GOP senators privately support convicting Trump 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 Devi HarrisOvernight Health Care — Presented by That's Medicaid — House passes sweeping Pelosi bill to lower drug prices | Senate confirms Trump FDA pick | Trump officials approve Medicaid work requirements in South Carolina Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Kamala Harris dropped out, but let's keep her mental health plan alive MORE (D-Calif.) and Amy KlobucharAmy Jean KlobucharSenate gears up for battle over witnesses in impeachment trial Booker says he will not make December debate stage Yang: 2020 rivals in Senate should be able to campaign amid impeachment 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.