> That's part and parcel the strategy of the left, shifting the Overton Window of what you're allowed to support publicly until anything representing traditional conservative values is safely out of range.

I strongly disagree: political polarization is not limited to the left. The right has used similar polarizarion and smear campaigns for decades in order to turn out single-issue voters: any politicians who is remotely pro-choice becomes anathema, regardless of the rest of their platform. Hillary Clinton was so effectively smeared, in 2016 a lot of voters disliked her, but couldn't articulate why. Since Reagan, the political Overton window in the US is has been sliding rightwards - not left.

Also, I am on the left.