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CANONSBURG, PA - MARCH 14: Conor Lamb, Democratic congressional candidate for Pennsylvania's 18th district, speaks to supporters at an election night rally March 14, 2018 in Canonsburg, Pennsylvania. Lamb claimed victory against Republican candidate Rick Saccone, but many news outlets report the race as too close to call. (Photo by Drew Angerer/Getty Images)
CANONSBURG, PA - MARCH 14: Conor Lamb, Democratic congressional candidate for Pennsylvania's 18th district, speaks to supporters at an election night rally March 14, 2018 in Canonsburg, Pennsylvania. Lamb claimed victory against Republican candidate Rick Saccone, but many news outlets report the race as too close to call. (Photo by Drew Angerer/Getty Images)

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    Pennsylvania election shakes up 2018 races

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Pennsylvania election shakes up 2018 races

As Conor Lamb is poised to deliver an upset in a district President Trump won by 20 percentage points, CNN is making changes to its rating of 17 House races - all of them in the direction of the Democrats.

Pennsylvania election shakes up 2018 races

As Conor Lamb is poised to deliver an upset in a district President Trump won by 20 percentage points, CNN is making changes to its rating of 17 House races - all of them in the direction of the Democrats.