I like this Idea!
Hope Send-A-Brick would do the following:
1) Offer the ability to submit a brief statement to your Senator/CongressCritter in the form of a Letter.
2) Shrink wrap the letter to the inside of the brick, with the text showing outward.
3) Mail it.
This way, it legally becomes a letter that the Postal Service must deliver, and can't(or shouldn't) be tossed along the way by Liberal USPS employees.
Knowing how the USPS works, someone will probably steal the bricks to build his/her patio deck! Only in America!
Heh, just let them think there is a political contribution of some kind in the envelope. They won't throw THAT away.
You can mail just about anything with properly addressed and affixed postage. People have mailed watermelons (direct marketing experiment I heard about).