Mitt Romney is making a big push for the Jewish vote. In classic Romney (i.e., clueless) form, his campaign scheduled a trip to Israel on the Jewish fast day of Tisha B’Av.
Tisha B’Av, which primarily commemorates the destruction of the first and second Temples, both of which were destroyed on the ninth of Av, is probably the most important event on the Jewish Calendar that most non-Jews don’t know about. Purim they’ve heard of, at least vaguely.
(Creating a field day for numerologists, the Ninth of Av was also the day that the Jews were required to leave Spain in 1492.)