While I dont think McCain is as dumb as Bush, his technological illiteracy (Not Just A Technological Troglodyte But Too Dangerous Also) and the poor grades in college he proudly admits to in this video do not give me confidence that he's a competent learner able to quickly come up to speed on the many intellectually complex issues he would face as president.
And why in the world, after Mr. C student's disastrous tenure, would we still want someone who thinks its funny to admit he was fifth from the bottom? Why is such an admission politically wise? Why does this admission make him a "regular" guy, as if being smart makes you "irregular," or that dreaded word, elite.
Instead, I want a political culture in which McCain feels he has to spin his poor grades, not proudly proclaim them. As Jon Stewart said back on April 15, this is what we should want in a president (starting at about the 7 minute mark):