Looks like you'd have a hard time getting a 10% flat tax plan to pass.
1. Federal Government spending is 6.3 trillion.
2. Current Federal tax revenue is 5.6 trillion.
3. GDP is 15 trillion.
So for the FEDS to get an amount to waste equal to current revenues, it looks like a flat tax would have to be in the neighborhood of 30% of GDP, On the other hand, right now 47% of the population pays zero income tax, so maybe that would level out a bit..................say to a 20% flat tax paid BY EVERYBODY.