Is this supposed to be a serious response? Those rights are not absolute, and you know it. You may not shout "Fire!" in a crowded theater. You may not commit libel. You may not "petition the government" by trying to kill the politicians who vote for bills you don't like. You may not "peacably assemble" in the middle of a freeway during rush hour and disrupt the freedom of thousands upon thousands of others in the process.
Your post just cannot be taken as a meaningful argument.
These folks, agree with them or not, are engaging in political speech. That there T-Shirts are for sale is not fundamentally different from books, magazines, or newspapers which contain political statements being for sale.
But I have a question for you. Would your opinions be the same if the T-Shirts were attacking the Clinton News Network in the same fashion?