The notion that Joe Biden can defeat Donald Trump again is somewhere between conventional sense and an article of faith for Democrats.
That idea is a crucial premise for Trump’s Republican primary rivals, most notably Florida Gov. Ron DeSantis, to persuade GOP voters to change their allegiance after supporting Trump twice.
But according to a new NBC News poll issued on Sunday, Biden only has a 49% to 45% advantage over Trump, which is far smaller than the 10 point advantage he had in NBC’s prev …