With just a little over two weeks to go before the election, the opponents of Proposition 23 have raised more than twice as much as the supporters of the measure. As of Thursday afternoon, foes of the initiative, which would suspend California’s landmark global warming law, had raised $19,632,061, while supporters have raked in less than half that, $9,077,509, according to Maplight.org.

But, as the San Jose Mercury News notes, the proponents of the measure had to spend $2 million of their cash to gather signatures to get the measure on the ballot in the first place, so they have that much less to spend on campaigning to pass it. 

The big-money backers of the initiative include oil interests, such as Valero, Tesoro and Marathon Petroleum. The hearty funding for the opposition is coming from environmental groups, venture capitalists and clean-tech companies. Among recent big contributions: Vinod Khosla, one of Silicon Valley’s big cleantech investors, kicked in $1,037,267 just this week try to defeat the measure.