Obama's turn-out reminds me of this line from Spinal Tap:
Marty: The last time Tap toured America, they where, uh, booked into 10,000 seat arenas, and 15,000 seat venues, and it seems that now, on their current tour they're being booked into 1,200 seat arenas, 1,500 seat arenas, and uh I was just wondering, does this mean uh...the popularity of the group is waning?
Ian: Oh, no, no, no, no, no, no...no, no, not at all. I, I, I just think that the.. uh.. their appeal is becoming more selective.