Republicans are panicked after Democrat Conor Lamb closed in on a victory over Republican Rick Saccone in a Pennsylvania congressional district that went for President Donald Trump by 20 points in 2016. That Lamb could perform so well in a district that overwhelmingly supported Trump and had sent a Republican to Congress without much contention for the better part of two decades signaled major challenges for the party as it seeks to maintain its congressional majorities in this year's midterm elections. "It's really hard to see how anyone looks at the factors Republicans are facing at this time, and the...