Go check Wiki for the page on that date (August 4). See what the first event in history is. Right there at the top of the page.
http://en.wikipedia.org/wiki/August_4
It doesn’t even note the Hebrew date, just the Gregorian.
And Obama’s arrival on the public scene at the Dem convention in 2004? That day was 9 Av (so okay, his speech occurred in the evening, IOW the 10th, but...??!)
http://en.wikipedia.org/wiki/2004_Democratic_National_Convention_keynote_address
Talk about being marked.
Though the Fleet center(site of the 2004 DNC Convention) is no longer called that, I thought it amusing at the time that the dems were holding their convention at a place that had the same name as an enema.