WASHINGTON (CNN)Sens. Kamala Harris and Elizabeth Warren have made steep gains after the first Democratic presidential debate, a new CNN poll conducted by SSRS, shows, with former Vice President Joe Biden’s lead over the field shrinking to a narrow 5 points.
The results indicate a significant tightening in the race for the Democratic nomination.
The poll, conducted after the two-night debate, finds 22% of registered voters who are Democrats or Democratic-leaning independents backing Biden for the party’s presidential nomination, 17% Harris, 15% Warren and 14% Sen. Bernie Sanders. No one else in the 23-person field tested hits 5%.

That represents a 10-point decline in support for Biden since the last CNN poll in May, while Harris, of California, has posted a 9-point increase, and Warren, of Massachusetts, has boosted her support by 8 points. No other candidates have seen significant movement since the last poll.

Harris’ numbers follow a strong showing on the second night of the debates. Among those who watched or followed news coverage about them, 41% say Harris did the best job in the debates, well ahead of the 13% who say Warren had the best performance and 10% who said Biden did.

Among those who say they watched all or most of at least one night of debates, Harris’ showing is even stronger: 46% say she did the best job, 19% Warren, 8% Biden and 5% each named South Bend, Indiana, Mayor Pete Buttigieg and former secretary of Housing and Urban Development Julian Castro.