Josh Marshall, in the aftermath of tonight’s Vice Presidential debate:

For reasons that are complicated and juvenile, during his vice presidency a caricature has emerged of Biden as some sort of Crazy Irish Uncle, gaffetastic and corny, a risible figure. That left people unprepared for what they saw tonight. Ryan was unprepared too. Biden’s actually one of sharpest guys in Washington and has been for decades.

I agree — I’ve been surprised for a while about how a good (and certainly fun!) SNL caricature has taken hold in the popular culture.