What we learned from Pennsylvania’s special election

U.S. Democratic congressional candidate Conor Lamb is greeted by supporters during his election night rally in Pennsylvania's 18th U.S. Congressional district special election against Republican candidate and State Rep. Rick Saccone, in Canonsburg, Pennsylvania, March 13, 2018. REUTERS/Brendan McDermid - RC190011A7B0
Editor's note:

At the time of this post, the Pennsylvania 18th District congressional election results are still too close to call.

Senior Fellow Elaine Kamarck explains the election results of the congressional race in Pennsylvania’s 18th district, where Democrat Conor Lamb received slightly more votes than Republican Rick Saccone, and how these results can be used to forecast trends in future elections.

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Elaine C. Kamarck is a Senior Fellow at the Brookings Institution and author of Primary Politics: Everything You Need to Know about How America Nominates Its Presidential Candidates. She is a member of the Democratic National Committee and a superdelegate to the Democratic convention.