Wouldnt be surprised if bama invited them and didnt put them on the list just to make the Secret Service look bad.
Somebody could have screwed up, and just said to themselves with nary a fart nor care, “well, to save my skin and my $75,000 job here, I’ll just blame this on the USSS. Case closed.” Plausible. Considering who and what we are dealing with in that White House. Yes, I want to check out this angle, too.