How did Conor Lamb win in a 2016 +20 Donald Trump district?
Jon Favreau explains it in one tweet:
If Lamb won running on these issues, in a heavily red gerrymandered district, then Democrats in 114 bluer districts can win too. Bottom line, Trump’s agenda is not in step with the majority of the American people. Not even in a red district like #PA18.
But the contest was never supposed to be competitive. In fact, there are 114 Republican-held House seats more competitive than Pennsylvania's 18th, according to a Democratic tabulation of the Cook Political Report's partisan voting index.
November 6th, 2018 is the reckoning for the Republican Party.