I'm probably not choosing my words very accurately; it occurred to me that the House conduct of the prosecution may be procedural, and arbitrary so far as regards the Constitution. But in any case, as a practical matter I cannot imagine that the Senate would ignore a House move to impeach, and even if they did I would think that the House would ask the Supreme Court to order the proceedings.
I think this is all silly anyhow. GWB is not gonna be impeached. Any scenario in which he were impeached would no doubt result in a Senate trial even if the GOP has control.
I think that even if the democrats were in control of both houses they would find the votes needed would be elusive. There are still enough rational democrats to make it an impossiblity.