The first thing libs like to do is to get the first shot. They get to spend the first minutes of any talk show spewing their filth uninterrupted by the polite conservatives and the polite host. this means they get one clear opportunity to get out their message. Once that is done, their next problem is to silence their opponent during his turn.
This is done by joking with the host, interrupting, or if the opponent won't shut up when interrupted, by shouting over the opponent so that nothing he or she says can be heard, and by interjecting comments in the hope of inducing a change in subject.
You see, the libs know there is never a need to win an argument if the liberal side is the only side heard.