By Kirk Cheyfitz and Liz Manne — A new story, by itself, can’t close the gap between the party’s promises and America’s reality. The day after the Capitol riot, with the American experiment seeming close to its expiration date, Congress certified Joe Biden’s 7-million-vote victory and the Democratic Party immediately began worrying. Distressed by losses in the House (13 seats), slimmer-than-anticipated gains in the Senate (4 seats) and modest-but-depressing increases in Republican control…