Don't forget the largest enablers of all---judges legislating from the bench.
The judicial branch is taking huge bites out of the legislatures. On every level.
How many times have we seen this; a legislature overturned by 'Unconstitutional', often with the most flimsiest of reason.
Your Constitution is flawed,
The Judiciary are largely appointed by the politicians. The Judiciary are not independent, they answer to their masters.
Equally bad, the Congress controls the executive, not only by laws, but by controlling the borrowing power, and borrowing was not envisaged by the Founders.