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While cutting taxes three times in less than a year, Gov. Scott Walker floated a radical and controversial idea for Wisconsin — eliminate the state income tax.

“That’s one thing for us to look at,” Walker told WisPolitics in December. “Is that feasible? What would that mean in terms of an economic boost?”

To put the idea in perspective: So far Walker has cut taxes by nearly $2 bil lion over his first term, according to the nonpartisan Legislative Fiscal Bureau. During that same time, the personal income tax will have generated nearly $30 billion in state revenue.

Walker has continued to promote his tax cuts on the campaign trail and says he will lower the tax burden each year in office, making taxation a key issue in the gubernatorial campaign.

But he has not yet laid out any specific tax cut proposals for a second term. On Friday he said eliminating the income tax is still an option but rejected the possibility of raising the sales tax to make up the lost revenue.