He was being asked to comment on Obama’s state of mind, hence he did. No indication he just now noticed.
I haven't been able to find any FNC video from 4Q2008 to support what I very clearly remember seeing/hearing, but Charles Krauthammer showed enthusiasm for BHO's candidacy and said he thought he would make a good POTUS. Ever since I have held CK at arm's length no matter how good his latest sound bites are.