Haven't they been circling since Iowa?

The Obama camp seems to be dialing back on the Dump Hillary drumbeat. Maybe it's pissing off her supporters and generating some donations. He is hitting PA pretty hard of late, which is the right strategy. If he can get close to beating her there, he might be able to put it away.

The other thing that could put her away is a sudden slide of supers his way. But the national polls seem to be tight again (that 12-point thing was an outlier), so the supers may hold their fire a bit longer.