@Alanna Said
There is a line between free speech and disorderly conduct. Free speech has been held by the courts to mean the right to respectfully disagree with any political, religious or social philosophy.
Disorderly conduct is held as interfering with a speaker's freedom of speech during a lawful assembly where people have gathered to hear the speaker speak. This includes such assemblies as church, town hall meetings, movie theatres, and presidential addresses to joint sessions of Congress.
While Republicans may think that disorderly conduct is ok. let me assure you that we will become a nation of chaos if everyone starts jumping up in church, movie theatres, and meetings and starts disagreeing with everything that is being said and interfering with the speaker's freedom of speech. There are ample venues for Americans to disagree without disorderly conduct.
Usually the Republicans are very quick to discipline their own so I don't think that any of them thought it was O.K. that Wilson shouted out that the president was a liar in the chamber.
The congress is allowed to yell out during the joint sessions but there is a list of what they are not allowed to yell out. Liar is on that list as well as traitor and a few other things. It would have been perfectly acceptable had Wilson yelled out that Obama was a nitwit for instance or a disgrace to the country.
I thought that was an interesting fact and I obtained it from a liberal radio commentator.