One problem with looking at polls about Biden's age specifically is people will say all kinds of things are bad and then vote against them because we vote for people all bundled up with all sorts of stuff we don't like
The only people somewhat consistent on this point are people who don't vote because they want Johnny Unbeatable for their personal electorate before they will stoop to compromise and those people are bad
Like, c'mon, I'm an inveterate poster, I'll volunteer my opinions on anything, but do you think I'm going to remove myself from my own democracy because neither candidate has the courage to impeach, exhume, try, and convict Nixon?
