President Joe Biden's top advisers are all too aware the ghosts of 1968 may haunt their convention here, but they're grappling with a pair of more urgent and thoroughly modern-day challenges as summer nears: How far can they go in reprising their virtual 2020 convention to mitigate the threat of disruption inside the arena, and how will they navigate a rookie mayor who unabashedly sympathizes with protesters?
DNC Preps for Worst in Chicago, With No Help From Mayor