From SacBee.com:
 
Any budget agreement between Democrats  and Gov. Arnold Schwarzenegger that skirts the state's two-thirds vote  requirement for new taxes will almost certainly be challenged in the  courts – and there's a significant chance the state would lose, some  legal experts said Monday.
It's not a slam-dunk case for either  side, though, law professors say, because the Legislature is largely  moving into uncharted territory with its plans to break the budget stalemate  by effectively replacing a tax that is tough to increase with a fee  that is much simpler to boost.
"The question is, 'What is a tax?’”  said Jesse Choper, Earl Warren Professor of Public Law at the University  of California, Berkeley. "It may be a simple little question, but  like most things, it can be more complicated."
 
Democrats and the governor are trying  to hash out a plan that would eliminate about half of the state's burgeoning  $40 million deficit. The foundation of the plan is a measure passed  by the Legislature last month that would raise some fees, lower some  taxes and come up with an extra $10 billion or so in revenue – all  without triggering the Proposition 13 requirement that any tax increase  be approved by a two-thirds vote in the Legislature.
 
The governor threatened to veto the plan,  then said he might go along with it if it contained several new provisions.  Republicans, who didn't have the votes to kill the plan, nonetheless  generally hate it and contend it violates the state constitution.
 
Daniel Simmons, a law professor at UC  Davis who specializes in taxation issues, said it would be tough for  Democrats to convince a court that a series of moves that results in  a huge increase in revenue from citizens doesn't constitute a tax increase.
 
"It sounds an awful lot like a tax  to me," Simmons said, echoing a similar sentiment from Choper.  "If they are not raising revenue (with the proposal), something  is very funny. It's very hard to make that claim."
 
