Deleted tweet detection is currently running at reduced capacity due to changes to the Twitter API. Some tweets that have been deleted by the tweet author may not be labeled as deleted in the PolitiTweet interface.
Joe Sestak @JoeSestak RT @SPrescottHarris: Great to see a number if new & familiar faces at the Federation of Democratic Women -#York summer soire w/@JoeSestak h… — PolitiTweet.org Posted July 26, 2015 Retweet Deleted after 6 years