I was reading your very long post, and before I even scrolled down to see what the name was I knew it was you. You have been very level-headed in this whole thing.
The tableau is set, the pieces are in place. Each side is one move from check-mate, but the President has the next move.
IF Bush proclaims a sea-to-sea Fence on Monday, and issues an Executive Order to start construction, the Republican base surges back together. His polls soar, and the Republicans keep Congress.
Any other move, and the Republicans lose it all.