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2018's open House seats

New today: House Speaker Paul Ryan won’t run for re-election, a decision whose timing was first reported by Axios’ Jonathan Swan.

By the time Nov. 6 rolls around, there will be at least 56 vacated House seats up for grabs — more than two-thirds of those are held by Republicans this term. The openings are significant because incumbents have outperformed non-incumbents of the same party in similar districts by about seven points in the last decade or so, per the New York Times.

Notes: The Cook Partisan Voter Index is a measure of how liberal or conservative a district leans based on the two most recent elections. Pennsylvania PVI and vote margins reflect the 2016 district map prior to being redrawn; Data: Daily Kos Elections and Cook Political Reports; Chart: Chris Canipe / Axios