This isn't meant to be a partisan discussion, simply a statement of the law. It bugs the shit out of me when people cite the First Amendment incorrectly. Here it is, verbatim:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
A good resource can be found here at the Cornell University Law School website: