Washington (CNN)Democrat Conor Lamb appeared to eke out a massive -- and massively important -- special election victory over state Republican Rep. Rick Saccone to claim a southwestern Pennsylvania congressional district that Donald Trump won by 20 points in 2016.

Lamb's apparent win -- no matter how narrow -- will surely rock the national political landscape. Republicans, already jittery about their chances of holding the House in November, will be thrown into panic by this result. And Democrats, already energized by the prospect of sending a message to President Trump, will be further convinced that November is going to be very, very good for them.
Here are seven takeaways from Tuesday's vote in Pennsylvania:

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