professorelemental:

In a shocking upset, New York Rep. Joe Crowley, who is the fourth-highest ranking Democrat in the House and had been considered a possible future speaker, has lost his primary to challenger Alexandria Ocasio-Cortez. A community activist, Ocasio-Cortez is a shoo-in to represent this heavily Democratic and Latino district that spans Queens and the Bronx.

As an avowed democratic socialist, Ocasio-Cortez ran a challenge from the left against Crowley, who has been in office for two decades and is chairman of the Queens Democratic party. Crowley had access to immense resources, and in the final months of the campaign, he outspent Ocasio-Cortez $1.1 million to just $127,000.

As an illustration of how big an upset this is;