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...