Story highlights Tara Setmayer: Trump's gripe about unfair delegate selection magically gone in N.Y., where he won, and GOP establishment rules

She says he grouses to delegitimize selection system when it doesn't favor him and his campaign is ill-prepared

Setmayer: How will he deal with upcoming Pennsylvania primary, where 54 out of the 71 delegates are completely unbound?

Tara Setmayer is former communications director for Rep. Dana Rohrabacher, R-California, and a CNN political commentator. Follow her on Twitter @tarasetmayer. The opinions expressed in this commentary are solely those of the author.

(CNN) Donald Trump's dominant win in New York had been a forgone conclusion for weeks. Trump's home state win marked the first time he'd accumulated over 50% of the primary vote in any state thus far. For such a big win, his victory speech was relatively low key: short, sweet and on message. For Trump, that is.

He threw in a few vague policy issues like repealing Obamacare and Common Core, things we hadn't heard in a while. Clearly Trump's recent staff shake-up to elevate seasoned campaign veterans like Paul Manafort is having an effect on Trump's behavior as a candidate. Noticeably absent this time were the petty insults and incoherent rants of the past. No trays of steaks and bottled water, as in his infamous hourlong infomercial speech March 8.

But Trump did, of course, repeat his accusations of the delegate selection system within the GOP as "rigged" and "crooked." He said, "It's nice to win delegates with votes. ... Nobody should take delegates and claim victory unless they got them from voters and voting."

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He even sympathized with Bernie Sanders, who Trump said he has seen "win, win, win, and ... they say he has no chance of winning, so they have their superdelegates; the Republican system is worse." It's important to note that Democrats' superdelegate system includes unelected party insiders, unlike the GOP. Isn't that interesting?

But Trump, in his New York victory lap, conveniently left out that the state is one of the least "democratic," states, by Trump's definition, in the way it selects delegates. The establishment party bosses actually do control selection of all the delegates in New York. Rules were changed after the 2012 election to do away with delegate slates filled by candidates' choices, in favor of state party officials handpicking their people. Plus, all those delegates are only bound to the primary winner — Trump -- on the first ballot.