California voters are open to the idea of creating a legal market for betting on college and professional sports but fewer than half of those surveyed in a new poll are sure of their support, an unsettled finding that serves as a prelude to a multimillion-dollar political battle in November.

A poll released Wednesday by UC Berkeley’s Institute of Governmental Studies and co-sponsored by the Los Angeles Times finds 45% of voters surveyed would support amending the California Constitution to allow sports betting. One-third of voters said they are opposed to such an effort while the remaining 22% of respondents — more than 1 in 5 — are undecided.

The poll did not ask voters to weigh in on any of the details of how California would establish legal sports betting. As many as three ballot measures on the topic could appear on the statewide ballot in November, each envisioning a different business model. The proposals are backed by rival groups promising to spend what could be a record amount of campaign cash to prevail on election day.

“It’s just anybody’s guess right now how an initiative might fare,” said Mark DiCamillo, the institute’s survey director. “They might be able to win if they can prove a benefit to the state and a lack of harm to the larger population.”

Read the full story on LATimes.com.