Finally, requiring a congressional declaration of war before President Bush invades Iraq smacks of imprudence. Tactical surprise, like our Overlord landings in World War II, would be confounded. And the leaking of classified information by Congress that could endanger our soldiers would be as certain as the Archimedes principle.
There won't be any tactical surprise. We'll have to move troops and equipment into place from over here.

The Overlord landings were expected. Just not in the location that they happened.

As for Congress leaking classified information, the same risks existed then as exist now.

The correct scenario is for Congress to formally declare war.

The US moves troops and equipment into friendly countries.

Invasion plans are drawn up.

Fake invasion plans are leaked and fake troop movements are staged.

The real invasion goes ahead.

Again, we've done almost this exact same thing back in WW2.