Proposition DD, the measure to legalize sports betting in Colorado, has pulled ahead, although the margin is still slight.

With more than 1.36 million ballots counted, Prop DD was passing by 17,089 votes early afternoon Wednesday, a lead of a little more than 1 point.

All 64 counties have reported, but there were still about 162,000 ballots left to be counted in metro area counties as of 12:30 p.m. Wednesday, according to data from the Colorado Secretary of State’s Office.

The measure to allow Coloradans to place bets on the outcome of sporting events had little opposition, but the ballot language, which characterized it as a tax increase under the Taxpayer’s Bill of Rights, may have put off some voters.

If passed, Colorado will allow for legal sports betting starting May 1. The state’s 17 casino operators would be allowed to apply for licenses for physical or online sportsbooks and pay a 10 percent tax on their net proceeds. The money would go toward Colorado’s water plan.

The Colorado Division of Gaming would regulate the market, and the state expects to collect up to $29 million a year from the new tax.

Curtis Hubbard, a consultant whose firm, OnSight Public Affairs, worked to help DD pass, said it’s only a matter of time before the race is called in favor of sports betting.

“The returns overnight and this morning have been promising, and we expect our margins to grow,” he said.