Democratic leaders and supporters of the bill insisted the postponement was only a temporary setback. The infrastructure vote was rescheduled for Friday, giving them more time to reach agreement on an expansive climate change and social safety net bill that would bring liberals along. The president has staked his reputation as a deal-maker on the success of both the public works package and a far more ambitious social policy bill, whose fates are now uncertain in a Congress buffeted by partisan divides and internal Democratic strife.