I wouldn't conflate shoddy journalism (in this case) or anti-Trump with left leaning. One can certainly disagree with our president but espouse conservative values. Karl Rove is not the biggest Trump fan, and I don't think anyone would classify him as liberal, and he's on the staff (writes a weekly column). Peggy Noonan, also definitely not a liberal but dislikes Trump, writes a weekly column. There is one guy on the editorial staff that I would say is left-leaning but in general they're not. There's one guy in particular that defends Trump no matter what he does (and later probably regrets it when Trump reverses course).
Perusing today's editorial page, I don't see anything that stands out as such either. The closest would be this I suppose
https://www.wsj.com/articles/trumps-offer-to-democrats-1517375033 but then again for me personally I find it hard to disagree with this part:
"His unpopularity beyond his base is due in large part to his divisive persona and 90-proof narcissism. Even admirers who like his bluntness want him to behave more like a normal President. The economy is gaining speed as he promised, and as wages rise the public mood has a chance to improve and he’ll get some credit."
However, there are opinions on that same page supporting the GOP position on the FBI fiasco, supporting Scott Pruitt, and pointing out that the Dems are not likely to want to make a deal.