The latest on Isaac
The Tampa Bay Times' Marissa Lang: Tropical Storm Isaac weakened slightly overnight as it moved into a patch of dry air and scattered, spreading the sprawling storm thin as it continued through the Caribbean early Thursday. But it's not going to stay that way. Forecasters expect Isaac to regroup, getting tighter and stronger as the day progresses. The storm could be a hurricane by the end of the day. Our partners at Politico. RNC communications director Sean Spicer: "There is no such thing as canceling."