He joins Joe Biden, Cory Booker, Pete Buttigieg, Kamala Harris, Bernie Sanders, Tom Steyer and Elizabeth Warren as the candidates who have already qualified for the November debate — accounting for eight of the 12 candidates who will participate in the fourth debate next week in Westerville, Ohio.

The qualification deadline will be one week prior to the debate, on Nov. 13. It will be in the Atlanta area. Further details like the exact location and format will be announced in the future.

Currently, more than a dozen candidates are still short of the qualification thresholds, including four who will be on stage next week in Ohio: Julián Castro, Tulsi Gabbard, Amy Klobuchar and Beto O’Rourke. Those four have all said they've cleared the 165,000 donor threshold required for the debate, but each needs at least three more 3-percent polls to qualify.

In the Quinnipiac poll, Warren and Biden are the two clear top-tier candidates. Warren has 29 percent to Biden's 26 percent. Sanders is the only other candidate in double-digits, coming in third at 16 percent.

The Quinnipiac University poll was conducted from Oct. 4-7 and surveyed 646 Democratic and Democratic-leaning independent voters. The margin of error is plus-or-minus 4.7 percentage points.