ED MORRISSEY: Settle down, Democrats.

Democrat Conor Lamb appears to have narrowly edged out Republican Rick Saccone in a district that went for Trump by 20 points, which certainly gives Republicans a headache they didn’t need and Democrats a reason to brag.

Does that translate to a blue wave in November, though? Almost certainly not. (Although that doesn’t mean a blue wave isn’t coming in November, either.) Using special elections as a harbinger for regularly scheduled contests ignores significant differences between the two, and the singular nature of most special elections.

Here are three key reasons to resist the urge to either pop champagne for Democrats or declare the GOP dead — at least on the basis of PA-18.

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