The one clear takeaway from Tuesday night’s Republican presidential debate was that the dynamic of the campaign has changed. The evidence for this is never in what the campaigns say, but in how they behave.

Ted Cruz and Marco Rubio have each clearly identified the other as the man to beat for the nomination. When the two of them got into a fight over immigration, they seemed to be the only ones on the stage. It took a question from the moderators to bring Donald Trump into a conversation about his campaign’s main and defining issue. One might have otherwise overlooked Trump, at least in that space of several minutes.