Depending on your source, the rally had either a few scattered thousand or about 175,000 people.
I went searching for photos. Here is what I found...
I found a conservative blogger
that tried to frame the event as sparsely attended.
I found on NPR a different story on the attendance. I would have gone, but I was working. I did have a friend who went, and their guess at attendance was roughly spot on with the reported number by NPR of 175,000.
I thought I'd post this because I don't feel it got much coverage. I recall Hawkeye claiming that the attendance would be pathetic.