In the span of a few months, the G-10 has gone from the center of politics in DONALD TRUMP’S Washington to the policy sidelines in President JOE BIDEN’S. While these senators mostly despised Trump, they were the engine of policymaking for his final Covid relief bill. While they mostly respect Biden, they have so far been irrelevant to his legislative push despite his inaugural promise of “unity.” It’s been a bewildering change for them. And if you want to understand both why Biden is winning and why his so-far successful formula could be in jeopardy, it’s worth listening closely to...