SACRAMENTO, Calif. — California voters have approved a measure that will impose strict requirements on counties to spend on housing and drug treatment programs to tackle the state's homelessness crisis, in a tissue-thin win for Gov. Gavin Newsom, who personally campaigned for the measure's passage.

Democrats outnumber Republicans by a staggering 2-to-1 in California, and the borderline vote — coming more than two weeks after election day — signaled unease with the state's homeless policies after Newsom's administration invested billions of dollars to get people off the street but no dramatic change has been seen in Los Angeles and other large cities.

The state accounts for nearly a third of the homeless population in the United States; roughly 181,000 Californians are in need of housing.

Newsom, who made the measure a signature proposal, spent significant time and money campaigning on its behalf. He raised more than $13 million to promote it with the support of law enforcement, first responders, hospitals and mayors of major cities. Opponents raised just $1,000.

Proposition 1 marks the first update to the state's mental health system in 20 years.

"This is the biggest change in decades in how California tackles homelessness, and a victory for doing things radically different," Newsom said in a statement after the borderline vote. "Now, counties and local officials must match the ambition of California voters. This historic reform will only succeed if we all kick into action immediately – state government and local leaders, together."

Counties will now be required to spend about two-thirds of the money from a voter-approved tax enacted in 2004 on millionaires for mental health services on housing and programs for homeless people with serious mental illnesses or substance abuse problems.

The state, with a current inventory of 5,500 beds, needs some 8,000 more units to treat mental health and addiction issues.

The initiative also allows the state to borrow $6.38 billion to build 4,350 housing units, half of which will be reserved for veterans, and add 6,800 mental health and addiction treatment beds.

Opponents, including social service providers and county officials, said the change will threaten programs that are not solely focused on housing or drug treatment but keep people from becoming homeless in the first place.

Critics said the single formula could mean rural counties such as Butte, with a homeless population of fewer than 1,300 people, would be required to divert the same percentage of funds to housing as urban counties such as San Francisco, which has a homeless population six times bigger.

With makeshift tents lining streets and disrupting businesses in communities across the state, homelessness has become one of the most frustrating issues in California and one sure to dog Newsom should he ever mount a national campaign.

Newsom touted the proposition as the final piece in his plan to reform California's mental health system. He has already pushed for laws that make it easier to force people with behavioral health issues into treatment.

William Elias, a television producer in Sacramento, said he "was on the fence" about Proposition 1 but decided to vote in favor of it because of the pervasive homelessness problem.

"That's something that's all around us right now," he said. "We got all these tents out here in front of City Hall."

Estrellita Vivirito, a Palm Springs resident, also voted 'yes' on the measure.

"It's only logical, you know, we have to do something," she said.

Katherine Wolf, a doctoral student at the University of California, Berkeley, said she voted 'no' on the measure out of concerns it would result in more people being locked up against their will.

"I was appalled of the system of laws that he has been building to kind of erode the rights of people with mental disabilities," Wolf said of Newsom.

Griffin Bovee, a Republican state worker in Sacramento, also voted against the proposition and said the state has been wasting taxpayer money.

"Sacramento really shouldn't get another dime until they actually figure out why what they're doing is not working," he said of the state's handling of the homelessness crisis. "They spent $20 billion over the past few years trying to fix that problem and it got worse."

Revenue from the tax on millionaires, now between $2 billion and $3 billion a year, provides about one-third of the state's total mental health budget.

Opponents, including some county officials, mental health service providers and some Republicans, said the ballot measure would cut funding from cultural centers, peer-support programs and vocational services and would pit those programs against services for homeless people.

Newsom's administration has already spent at least $22 billion on various programs to address the crisis, including $3.5 billion to convert rundown motels into homeless housing. California is also giving out $2 billion in grants to build more treatment facilities.

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