There’s been a massive shift among the all-important independent voters when it comes to the rematch between Joe Biden and Donald Trump. Joe Biden and Donald Trump. According to a new CBS/YouGov poll, Biden leads Trump among independent voters by two percentage points — 50% to 48%. It’s well within the margin of error, but amounts to a 17 point swing for Biden in June compared to March’s polling. Roughly 7 in 10 of the voters in the GOP primaries and caucuses identified as conservative. But in 2020, conservatives were less than 40% of the general electorate; the rest were roughly split between…