I think a good way to balance or engage better performance out of whoever is in office is to completely rid the federal tax. All people will pay their state tax, and the local/state government will be responsible to provide the federal government money out of the state pool. I think it will drastically change 1) how much the federal government can spend 2) What it gets spent on because the states would much rather keep that money pool to spend internally.
Endless wars would change. Infrastructure would be a larger discussion, etc...