Tom Steyer, the billionaire and former hedge fund investor turned impeachment activist, became the 11th Democratic presidential candidate to qualify for the October debates on Sunday after a new poll showed him with 2 percent support in Nevada.

To make the cut, candidates must procure donations from 130,000 people and earn 2 percent support in four qualifying polls. Mr. Steyer fell one poll short of qualifying for the third Democratic debate in Houston this week. But the Democratic National Committee’s rules allow polls to carry over and count toward qualification for the fourth set of debates.

With three qualifying polls already under his belt and the fourth published Sunday, Mr. Steyer has now secured a spot in the debates next month, scheduled for Oct. 15 and possibly Oct. 16, in a location to be announced in Ohio.

“We are thrilled that Tom will be able to share his vision — of how together we can fix our broken political system — with the American public,” his campaign manager, Heather Hargreaves, said in a statement on Sunday.