I think we need to look at Obama’s rally size too. Because that may make Mitt’s rally size more meaningful.
I think Obama is not getting the publicity for large rallies because his have shrunk to fairly small size compared to four years ago. I think Brian Williams commented that Obama’s campaign didn’t look the same as four years ago. He was referring to the lack of energy and smaller crowds.
Romney’s rallies are looking more energetic and are consistently bigger than Obama’s especially this week.
Obama Attracting Smaller Crowds than McCain in ’08
http://www.nationalreview.com/corner/332413/obama-attracting-smaller-crowds-mccain-08-eliana-johnson
Campaigning in Mentor, Ohio today, President Obama drew a crowd of 4,000. RNC research director Joe Pounder notes that, four years ago, John McCain drew a bigger ground to the same venue.