The actual harm reduction candidate was... Nobody. There wasn't one. The harm was always going to happen, there was no choice to have less of it. The only choice was who you wanted to do the harm, who you wanted the harm to be done to, and where you wanted that harm to be done.
Trump is the harm reduction candidate insofar as he galvanizes the libs in Congress to oppose shit like this. The same thing happened with NAFTA. Bush Sr. wanted to do it when he was president and the Dems told him to pound sand. Clinton gets into office and all of a sudden, the opposition vanishes and NAFTA gets through along with welfare cuts and the crime bill.
If I was the GOP I would demand that Biden not only do all this, but also criminalize abortion at the federal level, cut the top tax income tax rate to 15%, and repeal MLK Jr Day as federal holiday. Why not, Biden will do absolutely anything to make sure Ukraine and Israel get more money.
It's always funny when liberals say, "You care more about brown and marginalized people abroad than you do at home" as they defend this bullshit because Republicans made him do it. Spineless idiots.