DELRAY BEACH, Fla. — Mitt Romney’s first debate bounce has evaporated and President Obama once again has taken a slim lead in The Washington Times/Zogby Poll released Sunday night — though the survey showed Mr. Romney’s backers are far more energized about him than the president’s backers are about their candidate. Mr. Obama leads 49.7 percent to 47.3 percent over Mr. Romney, the Republican nominee, with 3 percent undecided.