Sen. Mark R. Warner sighed and stopped to confront two aides staring at their phones and leading him in circles around downtown Philadelphia. On Day?2 of the Democratic National Convention, humidity topped 90 percent and the senior senator from Virginia was late again.
“Are we going this way? Do you guys know?” he said, a suit jacket slung over his sweaty shoulder.
At the moment Virginia’s other senator, Tim Kaine, was preparing to accept the Democratic nomination for vice president, Warner was, well, lost.

