I've always kind of liked Heinlein's proposal (from "The Moon is a Harsh Mistress"):
Require a 67% majority vote of the legislature to PASS a law, under the assumption that any proposal which cannot satisfy at least 2/3's of the people is not a good law; then allow a law to be repealed with only a 34% minority, for the same reason.

Also, since EVERY law has to go to the President for signature, allow a "Line Item Veto" to limit the number or "add ons" which lawmakers sneak into otherwise important legislation to force it through. And make it more difficult for those legislators to put those extras into place.

Eliminate the Income Tax: replace it with a national sales tax. There would have to be some provision for compensating the poor, based upon income, but those are details.

Penalize those US Companies which export jobs overseas. And customize the taxes on imported goods for the country they're being imported from. A "tit-for-tat" scheme would work best: if you raise the duties on American products exported to your country, we'll do the same with products imported from yours.

Lots of other things along the same lines. Wishful thinking, I know. Comes from being an honest man, I guess.