Why is this so difficult for Washington?
Beacuse they have favors to sell using the tax code to buy favors and votes. They have boogie men to gouge like the "evil rich" to pander for votes.
A simple flat tax takes their power away. They can't give tax breaks to favored groups to win their votes.
Washington is broken and the only way to fix it is to throw everyone out, create term limits and a flat consumption tax. PERIOD.