Joe Biden ran for president promising to be a savvy dealmaker in Congress. But now, with his domestic agenda threatened by disagreements within his own party, he is facing the ultimate test. Biden spent Wednesday afternoon and evening huddling in the Oval Office with three groups of Democratic lawmakers, trying to convince them to overcome their differences to pass an infrastructure bill that would invest $1 trillion in repairing the country’s aging roads and bridges, and a $3.5 trillion bill that would expand healthcare, childcare and community college, and authorize paid family leave.