http://www.whitehouse.gov/contact/
Please send a message to support Tom Tancredo. Here is what I wrote:

I hope someone was listening when Tom Tancredo was getting death threats this week. It is an outrage that an American has to fear for his life because he is using his right to free speech. Illegal immigration has been a huge problem for quite some time now. While politicians were busy being PC, innocent citizens suffered at the hands of illegals. Help get our country back before it is too late.