The history of walls or barriers between countries have a history of bloodshed and failure, which Tom Tancredo and others should take into account. Congressman Tom Tancredo (r-Colorado) ask President Bush to 'man' the American/ Mexico Border with US Military troops just a few days ago.
The China Wall ( a Wonder of the World site) failed to keep out the barbarians, the Berlin Wall failed to keep its citizens within its boundaries, and the two barriers erected by israeli, the Gaza Strip Barrier and the West Bank Barrier, has only inflamed the Palestinians to further violence. The Walls and Barriers tend to do just the opposite of their intended purpose, as will the American/Mexico Wall proposed by Mr. Tancredo.
What the Walls have done is hindered communications and information between adversaries. All of the Walls, Barriers, and fences, have had their temporary days of infamy amid bloody violence, which have lead us, and will lead us nowhere.
Rather, we need an open and free dialog with those across the contentious borders, and not wall them off. Solutions require intelligent input from all sides of a border dispute, and the more complex the dispute, the higher the intelligience level must be.
As Progressive Democrats we can take the lead away from 'shoot-em-dead' Tom Tancredo and his supporters by opening up free and open two-way discussions with the Government, the politicans, and the people of Mexico and not build a Wall of Hindrance beween us.

The 4th Amendment does not leave "wiggle room" for our Government and its agents to search and seize without a sworn warrant. And as the President and his agents can aquire legal warrants quickly, securely, and secretly there is no excuse not to obtains the necessary warrants.
The 1803 Supreme Court ruled in the Marbury v. Madison case that "an act of Congress is null and void when it conflicts with provisions of the US Constitution.". This was one of the most important, if not the most important ruling that the Supreme Court ever made, for it rules that the US Constitution is the preimere law of the land.
It matters little, the machinatations that the President and his agents go through, to subvert the IV Amendment for their own use. The IV Amendment is a clearly written declartative sentence that, really, cannot be tarnished.