The much-ballyhooed bipartisan infrastructure agreement was always a shaky proposition. When President Joe Biden announced the accord last month-"We have a deal," the beaming president proclaimed outside the White House, flanked by 10 beaming senators-all the negotiators had agreed to was an outline, a three-page sketch of how to spend $1.2 trillion on roads, bridges, rail, and broadband, and a list of "options" of how to pay for it. They hadn't figured out any of the details, much less written an actual bill.