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Gov. Chris Gregoire said Tuesday she thinks a court challenge is needed to show whether tax increases in the Legislature actually require a two-thirds vote to be enacted.

Several House Democrats set the stage for a possible court challenge when they brought a bill closing a bank-tax exemption to a floor vote May 24. The bill got 52 votes, enough for a majority, but it failed to meet the supermajority test of 66 yes votes required by Initiative 1053.