Biden's lead narrows in early voting states: poll

Joe BidenJoe BidenTrump hits Fox News's Chris Wallace over Ukraine coverage Schiff: Whistleblower testimony might not be necessary Trump warns Democrats will lose House seats over impeachment MORE's lead atop the Democratic primary field in early voting states has narrowed, according to a CBS poll released Sunday.

The former vice president enjoys a 5 point lead over his closest competitor, with 25 percent of likely Democratic voters in states holding their primaries before or on Super Tuesday saying they would vote for Biden if the primary or caucus were held today.

Sen. Elizabeth WarrenElizabeth Ann WarrenSanders can gain ground by zeroing in on corruption Biden praises Buttigieg for criticizing GOP attacks: 'That's a good man' Warren enters crucial debate with big momentum MORE (D-Mass.) is the second choice of voters in the 18 states surveyed, coming in at 20 percent.

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Sens. Kamala HarrisKamala Devi HarrisRepublicans wrestle with impeachment strategy Klobuchar takes shots at health and education plans supported by Sanders and Warren Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' MORE (D-Calif.) and Bernie SandersBernie SandersSanders wishes Ocasio-Cortez happy birthday Video of fake Trump shooting members of media shown at his Miami resort: report Sanders can gain ground by zeroing in on corruption MORE (I-Vt.) are in tight competition for third, at 16 percent and 15 percent support, respectively.

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegTrump hits Fox News's Chris Wallace over Ukraine coverage Sanders can gain ground by zeroing in on corruption Biden praises Buttigieg for criticizing GOP attacks: 'That's a good man' MORE (D), at 6 percent, former Rep. Beto O'RourkeBeto O'RourkeButtigieg pushes back on O'Rourke threat to strip religious institutions of tax-exempt status O'Rourke raises .5 million in third quarter Conservatives slam Beto O'Rourke over threat to tax-exempt status for religious organizations MORE (D-Texas), at 4 percent, and former Housing and Urban Development Secretary Julián Castro, at 2 percent, are the remaining candidates scoring above one percent support.

Warren and Harris, at 55 percent and 53 percent, lead the field in terms of who respondents are considering voting for.

CBS' surveyed 8,760 registered Democratic voters in early states between July 9 and 18. The margin of error for the sample is 1.5 points.

Sunday's CBS poll is a significant shift from a similar one released June 16.

In that survey, Biden lead in early states at 31 percent support, followed by Warren at 17 percent and Sanders at 16 percent. Harris was fourth at 10 percent support.

That survey also looked at 18 states, but included Georgia instead of Maine.

The shifts in support in those states generally line up with how the first Democratic presidential debate was perceived: Warren holding her own on night one, and Harris being applauded for taking on Biden on night two.