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Completing an amazing trifecta of Special Elections in long-held GOP seats this spring, Democrat Travis Childers has won the Special Election in MS-1, defeating Republican Greg Davis (53-47 at this writing).
Following the wins of Bill Foster in IL-14 and Don Cazayoux in LA-6, and each district being more progressively Republican, Childer's win is going to send shock waves throughout the political community. This district has a Partisan Voter Index (PV) of R+10, meaning on average it votes 10% more Republican than the nation as a whole. If every district with a PV of R+10 was in play in November, that's 50 seats the GOP will have problems defending.
Oh, and yes, Childers becomes the 796th superdelegate, pushing the total number of delegates to 4049, and the number of delegates needed to win is now 2,025. See Superdelegate Ups and Downs for the complete history of the changes in the number of superdelegates. Childers is Uncommitted at this time.
Update: Josh Marshall notes the number symbolism that the GOP House caucus is now at 199.
Update 2: Swing State Project reminds us: Bush won this district 62-37, by 25 points! Districts like this are just not supposed to switch. An incredible win for the Democrats.