Sorry to nitpic earlier, but I work at an NBC affiliate, and it makes a big difference whether we preempt the network primetime to go to an NBC news feed or local breaking news...or stay with network coverage if they are pre-empting their own primetime (ad revenue and all). In this case Fox is staying with "Trading Spouses", and most (if not all) local Fox affiliates in the Eastern time zone are breaking away from network programming for the presidential speech.
No need to apologize for picking nits - I excel at that myself.