WASHINGTON - Striking a deal with moderates, House Democratic leaders muscled President Joe Biden’s multitrillion-dollar budget blueprint over a key hurdle Tuesday, ending a risky standoff and putting the party’s domestic infrastructure agenda back on track.The 220-212 vote was a first step toward drafting Biden’s $3.5 billion rebuilding plan this fall, and the narrow outcome, in the face of stiff Republican opposition, showed the power a few voices have to alter the debate and signaled the challenges ahead still threatening to upend the president’s agenda.After a turbulent 24 hours that brought House proceedings to a standstill, Speaker Nancy Pelosi told her colleagues before the vote that the legislation would lead to a federal investment.