So did Nancy Pelosi, of all people. :)
I think what is being shown here, whether the people doing these things actually believe what they say or not, is the old message to the world that Americans are like siblings... we fight and fuss amongst ourselves, and sometimes do so to extremes, but we will stand together when we have to. That is a good message to send.
You know what the difference is between a true politician and a normal, everyday run of the mill citizen is, don't you? The Politician treats insults and attacks as "Business as usual", the citizens take such things to heart.