this is just...disrespectful and disgusting.
the video doesn't show who was screaming: if it was senators, spectators, staffers, or whoever. i don't care. anyone present for that session should know better than to disrupt the session: be it the beginning prayer, senate debate, or anything else. furthermore, it's not going to speak well of the religion that you're screaming about to interrupt or insult a blessing by a cleric of another faith. even if you don't see religion the same way as the cleric who is speaking, it's no reason to be disrespectful of him.
besides, there's nothing saying that the Senate is a Christian organization...we've still got this little thing called the Establishment Clause, and there's no set state religion. it's perfectly appropriate for anyone of any belief system -- monotheist, polytheist, pantheist, atheist -- to be able to give an invocation before a lawmaking session in this country. allowing a cleric to say an invocation before session isn't tantamount to framing theirs as the one true faith; rather, it's tantamount to saying "we are a nation of religious freedom, and people of your faith are welcome here, just like everyone else."
he deserved basic human respect, and i'm embarrassed that not everyone in that Senate session showed it.