Actually, since the audience for presidential primary
debates is pretty specialized in the first place, it's not clear
how many viewers will be lost to baseball. But to the degree some
are, it makes the overall performance of each candidate through the
hour-and-a-half of the debate less important, and producing
a memorable soundbite or a winning exchange more crucial.
A higher percentage than usual of potential voters will get their
impression of this debate not from watching all or most of it, but
from news accounts of it. And those accounts will
feature only a couple of answers or exchanges. So the candidates
will be spending even more time than usual today preparing their
memorable ad libs and rehearsing their off-the-cuff
witticisms.
Perhaps this helps explain why the candidates were in especially
good form -- they were exta-prepared to grasp for the soundbite.