Michigan voters go to the polls today to vote on Proposal 1, a referendum that would hike the state sales and gasoline taxes. An unexpected twist in the story, though, is who is backing the plan and why. Support for the proposal speaks to the declining state of infrastructure in the U.S. and the increasing urgency with which states are taking matters into their own hands.

Proposal 1 is a complex mix of policy changes that would raise more than a billion dollars to fund road construction and repair, plus hundreds of millions for education and other purposes. It would do so by hiking the Michigan state sales tax from 6 percent to 7 percent. That represents a 17 percent increase in total sales taxes Michiganders will face on taxable items.

Related: America’s Energy Infrastructure in Desperate Shape

However, the bill also abolishes the sales tax on gasoline – Michigan is one of the few states in which gas is not exempt from state sales tax – and would dramatically increase the wholesale gasoline tax. The net effect, according to the Detroit Free Press, would be an increase of between 7 and 9 cents per gallon in what consumers pay at the pump. The proposal would net about $1.9 billion per year for the state’s coffers, the majority of it coming out of the pockets of Michigan’s taxpayers. (A small percentage would come from out-of-state visitors paying taxes on items purchased in Michigan.)

Normally, a $2 billion tax hike – the biggest in the state in a generation – would be the sort of thing Republican politicians would attack mercilessly, but in Michigan, Republican Governor Rick Snyder is a strong proponent of the deal. And Snyder isn’t alone. Prominent Republican and Democratic lawmakers have thrown their support behind the measure.

Related: Get Ready to Pay More Tolls If Infrastructure Isn’t Funded

The move also has significant support from the business community. Unsurprisingly, the biggest backers of the deal are the construction companies and related industries. But there is also support in the general business community, even among some companies whose products would be more expensive.

Even with substantial support from legislative leaders and businesses, though, the prospects for Proposal 1 looked poor heading into the vote today Public opinion remains generally against the proposition despite a multimillion-dollar advertising campaign by supporters that has dwarfed efforts by the opposition.

Should the vote fail, though, the state’s pothole-pocked roads and crumbling bridges won’t fix themselves, so legislators will have to find the revenue somewhere, either by increasing taxes via a different route, or cutting spending from an already tight state budget.