I just found another instance in which we could be seeing a special election. Two representatives from Pennsylvania are competing to be the Democratic nominee for the Philadelphia mayoral race.
According to Wikipedia, though, neither is likely to win the nomination.Still too early to say; that race is all over the place. Although both seem to have been declining in polls - perhaps just because they had higher initial name rec than some of their rivals.
Brady's seat could make for a VERY interesting primary fight, though.