In any contest between closely matched political factions, the key to victory lies in winning over those uncommitted to either dominant group. For Democrats and Republicans in this year’s razor-thin presidential race, that means convincing skeptical independent voters that one or the other of Joe Biden or Donald Trump is the less-awful choice. Right now, with Americans disappointed in both the economy and the man whose “Bidenomics” they see as responsible, the advantage goes to the former, and quite possibly future, White House resident.