Ramesh Ponnuru Bloomberg Opinion George H.W. Bush was out of touch. Bill Clinton was untrustworthy. George W. Bush was a Bible-thumping ignoramus. Barack Obama was a radical. Donald Trump was, well, Donald Trump. Whatâs Joe Biden? As American politics has gotten more polarized, it has also focused more and more on the personality of the president â to the point where it became the dominant issue of much of the Trump years. Personality-based criticism of Biden, though, has so far not stuck. Thatâs good news for the Democrats, except that it may be making them overconfident. Republicans made a sustained effort to portray him as doddering last year, but voters ended up being slightly more likely to think that Biden had the mental capacity to be president than that Trump did. The Republican tactic may even have backfired by making Bidenâs performance look better than it otherwise would have. But Bidenâs opponents are still trying to make this case, with new hope every time the president shows his age.