IMHO, the people would revolt. That, and the budget would be dramatically reduced every election year as pols would magically find fat to trim, to 'buy' votes with lower taxes. :-)
BTW, I can't STAND idiots who give me the 'look how much I got back' line in Feb/Mar of every year. Fools, all of them.
I agree. Get rid of tax whithholding, move tax day to 1 week before federal elections, mark incumbents on the ballots.