With less than a month until November’s election, a poll released Tuesday shows one of two state propositions that would greatly expand sports gambling stands a chance at passing.

Sports gambling companies, California tribes and card rooms have spent more than $410 million for and against Proposition 26 and 27. The former would allow in-person sports betting at tribal casinos and horse racetracks. The latter would allow online sports betting on platforms run by tribes and gaming companies.

Early this month, neither looked likely to pass. Only 31 percent of voters supported Proposition 26, and even fewer — 27 percent — supported Proposition 27, in a poll from the UC Berkeley Institute of Governmental Studies.