(Adds comments by Assembly speaker, finance department)

By Jim Christie

SAN FRANCISCO, July 6 (Reuters) - California suffered a new setback in its financial crisis on Monday when Fitch Ratings cut its rating on the state's general obligation debt to just two notches above junk status.

Fitch cut its rating on California's long-term bonds to "BBB," two notches above speculative grade, citing the state's budget and revenue crisis.

The state last week started issuing "IOU" promissory notes for some bills to conserve cash for priority payments, including payments to investors holding the state's debt.

The rating agency also kept the debt of the most populous U.S. state on watch for additional downgrades. California ranks as the lowest-rated state general obligation credit by Fitch, followed by Louisiana, at "A+."

Tom Dresslar, a spokesman for State Treasurer Bill Lockyer, said the other two main credit rating agencies, Standard & Poor's and Moody's Investors Service, could soon follow Fitch's example. "I'm sure their patience is not deep," he said.

Lower ratings could raise California's borrowing costs during a severe cash crunch in Sacramento, the state capital, where talks between Governor Arnold Schwarzenegger and lawmakers to plug a $26.3 billion budget deficit for the fiscal year that began on July 1 are plodding along.

"If we're forced to pay tens of millions of dollars, if not hundreds of millions of dollars, in higher interest costs because we have a delayed budget, that's tantamount to lighting money on fire," said H.D. Palmer, a spokesman for the state's Department of Finance. "That's money that we could be spending on things like health care or education."