You're one of those that strictly adheres to the text of the First Amendment aincha? Well, what in the hell does Congress have to do with television stations not running an advertisement? What law has Congress passed via a vis this here advertorial that you find violates the right of this here "Latinos for Reform" group?
Congress doesn't have to pass a law, the 1st Amendment covers it!
[ame="http://en.wikipedia.org/wiki/Freedom_of_speech_in_the_United_States"]Freedom of speech in the United States - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File

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Freedom of speech in the United States is protected by the First Amendment to the United States Constitution and by many state constitutions and state and federal laws. Criticism of the government and advocacy of unpopular ideas that people may find distasteful or against public policy, such as racism, sexism, and other hate speech are generally permitted. There are exceptions to these general protection, including the Miller test for obscenity, child pornography laws, speech that incites imminent danger, and regulation of commercial speech such as advertising. Within these limited areas, other limitations on free speech balance rights to free speech and other rights, such as rights for authors and inventors over their works and discoveries (copyright and patent), interests in "fair" political campaigns (Campaign finance laws), protection from imminent or potential violence against particular persons (restrictions on fighting words), or the use of untruths to harm others (slander). Distinctions are often made between speech and other acts which may have symbolic significance.
Flag desecration has continually, albeit controversially, been protected by the First Amendment, despite state laws to the contrary. A Constitutional Amendment has been introduced to contravene the First Amendment's protection on flag burning, but it has failed to acquire the requisite enactment by the states.
Despite the exceptions, the legal protections of the First Amendment are some of the broadest of any industrialized nation, and remain a critical, and occasionally controversial, component of American jurisprudence.