Supporters of a ballot proposal to increase Arizona’s  sales tax to 6.6% from the current 5.6% to finance transportation projects last week filed official papers with the secretary of state to begin the petition drive for a spot on the November ballot.

The additional 1% tax would generate $42.6 billion during its 30-year span, according to leaders of the Transportation and Infrastructure Moving AZ’s Economy Coalition. If approved, the increase would go into effect Jan. 1, 2010.

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