One bill, One purpose
Amend the constitution, or set a presidential policy for one bill, one purpose. So many pork projects and wasteful spending items get tacked onto other important bills to garner support.
One bill, one purpose means exactly what it says. If you're going to have an education funding bill, there shouldn't be military spending in it. If you're going to pass a security bill, there shouldn't be funds for a museum in Iowa in it.
If something can't pass on its own, it shouldn't pass. Period.