"Professor, what's a 'filibuster'?"
For example, most people over 30 or so know what a filibuster is, but my experience with college students suggests only a small percentage of high-school seniors do. Thus when bloggers complain about Democrat senators filibustering W's judicial nominees--or when talk radio takes up the same subject--I'm not sure many kids under 25 actually understand what's up.
Of course, if you don't know what a filibuster is, and its historical usage, you can't understand why this tactic might sometimes be considered unreasonable.
Just my two cents...