If there’s a word that can sum up our national leadership these days, it is “lame” — a lame-duck session of Congress, a lame-duck president, all yielding results that are totally lame. Republicans already are sharpening their spears in anticipation of taking majority control of Congress in January. Yet Democrats and Republicans trade power on both sides of Pennsylvania Avenue every few years, engaging in the same duels and echoing each other more than they realize, so real change is iffy.