There's a thought

Brad DeLong has an interesting little fantasy:

There's still time for the House and Senate Republican caucuses to go to Bush and force his and Cheney's resignations. Then Hastert and Stevens can decline the job, and the presidential succession passes to Colin Powell.

....

It's what would have already happened to any political leader in a parliamentary system.

Now that's interesting. One of the things I wish I knew more about is how different forms of respresentative government work in practice. There's a few hundred constitutions out there — surely someone has done a longitudinal study?