[The_Reader_David]

These are national networks - every one. Same commercials being run nationwide.

I don't think so, most slots on cable-only channels are sold by the local cable provider. (Or at least that's the way it looked to me back when I had cable.)

[Republican Wildcat]

No, not most of them - some of them. You can also tell the difference if you observe very closely. Obama is in fact airing heavily nationally on cable networks.