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This has irked critics, who point out that the proposal will also lower tax rates on several of the state’s casinos. With these changes, more than two-thirds of the projected additional $700 million in expected annual revenues would go to casino operators rather than state or local government.

The campaigns for and against Question 7 have been mostly bankrolled by the two casino developers that have the most to gain and lose from a potential Prince George’s casino.

MGM Resorts International, which has expressed interest in building a Prince George’s facility at National Harbor, has given $14.4 million to For Maryland Jobs and Schools — a committee that has spent $17.7 million in support of Question 7.

Opposition has been led by Get the Facts - Vote No on 7, a committee that has spent $18 million and received $21.6 million from Penn National Gaming Inc., which runs the Perryville casino as well as the Hollywood Casino in Charles Town, W.Va., about a 90-minute drive from Washington. D.C.

Analysts have said a Prince George’s casino would compete directly with the West Virginia facility for visitors from the D.C. metro area.

Mr. Franchot accused state officials of kowtowing to billionaire developers. He also contended that added gambling revenue for the education trust fund would not guarantee any added funding for schools.

He said that the state has set funding levels each year for education, and that any extra school money from gambling in the past has been canceled out by an equal reduction in school funding that comes from other revenue sources.

“Whatever money goes into the education trust fund gets backed out on the other end” he said. “Education funding has nothing to do with slots machines. We would still have the education budget we have now.”

Mr. O'Malley, a Democrat who called the special session to pass a bill allowing the referendum, has dismissed assertions that gambling revenue has not helped schools, calling them “crap,” “hogwash” and “a bunch of West Virginia casino hooey.”

O'Malley spokeswoman Raquel Guillory on Thursday called opponents’ arguments “false and inaccurate.”

“Whether it’s for capital projects or new schoolbooks, that money will be used for schools,” she said. “And just as important are the number of jobs it will create.”