Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden

Sen. Bernie SandersBernie SandersHillicon Valley: Amazon wins union election — says 'our employees made the choice' On The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists MORE (I-Vt.) led the Democratic field in a Sunday CBS News-YouGov poll that also saw Sen. Elizabeth WarrenElizabeth WarrenOn The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists POW/MIA flag moved back atop White House MORE (D-Mass.) rise to second place following a strong debate performance last week.

Sanders led with 28 percent, followed by Warren with 19 percent, former Vice President Joe BidenJoe BidenBiden eyes bigger US role in global vaccination efforts Trump says GOP will take White House in 2024 in prepared speech Kemp: Pulling All-Star game out of Atlanta will hurt business owners of color MORE with 17 percent and former New York City Mayor Michael BloombergMichael BloombergThe truth behind companies' 'net zero' climate commitments The strategy Biden needs to pass his infrastructure plan Bloomberg, former RNC chair Steele back Biden pick for civil rights division MORE with 13 percent. Former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegSunday shows preview: Democrats eye two-part infrastructure push; Michigan coronavirus cases surge Buttigieg hopes cruises will return by mid-summer Biden to host bipartisan talks on infrastructure next week MORE and Sen. Amy KlobucharAmy KlobucharLobbying world New small business coalition to urge action on antitrust policy Bottom line MORE (D-Minn.) rounded out the field with 10 percent and 5 percent, respectively.

Fifty percent of respondents said they found Warren the most impressive candidate at last week’s debate in Las Vegas, where she took aim at Bloomberg’s history of sexist remarks in the first debate for which the former mayor qualified.

The poll also showed Sanders performing best against President TrumpDonald TrumpHarry Reid reacts to Boehner book excerpt: 'We didn't mince words' Man arrested for allegedly threatening to stab undercover Asian officer in NYC Trump says GOP will take White House in 2024 in prepared speech MORE in a head-to-head match-up, at 47 percent to 44 percent, followed by Biden, with 47 percent to 45 percent and Warren with 46 percent to 45 percent. Buttigieg and Trump were tied in a head-to-head match-up at 44 percent each, while the president led Klobuchar 45 percent to 44 percent and Bloomberg 45 percent to 42 percent.

However, the poll also found that 65 percent of voters expect Trump to be reelected.

The poll was conducted Feb. 20 to Feb. 22 among 10,000 registered voters, including 6,498 Democrats and independents planning to vote in the Democratic primary. The full sample has a 1.2 percentage point margin of error, while the sample of likely Democratic primary voters has a 1.7 percentage point margin of error.