The debt ceiling standoff is giving a stress test to Biden's presidential playbook

On Sunday, Biden called on Republicans "to move from their extreme positions because much of what they've proposed is simply, quite frankly, unacceptable." "There's no bipartisan deal to be made solely, solely, on their partisan terms. They have to move as well," he said during a news conference that closed his visit to Japan for the G-7 summit. Biden's reluctance to play hardball up to this moment had been driven by twin political bets: That he would come off as a steady hand in stark contrast to the extremes of the Republican Party; and that voters will tune out the…