President Trump has unveiled one of the simplest candidate tests in modern politics: Do you look like you belong on the stage? At his Saturday rally in Highland Heights, Kentucky, Trump brought Republican House candidate Ed Gallrein into the spotlight and sized him up in the unmistakable language of a man who spent decades studying television, crowds and first impressions.

Gallrein, a retired Navy SEAL and fifth-generation farmer, received the full Trump treatment: praise for his appearance, his bearing and the sense that he had been pulled straight from “Central casting.” Critics will laugh. They always do.

But Trump’s point was not really about jawlines or facial features. He was talking about something professional political consultants often bury under a mountain of polling jargon: presence. The moment quickly ricocheted around social media, where even Trump’s detractors understood exactly what he was doing.

Politics is not a résumé contest. Voters rarely meet candidates in a quiet office and compare policy binders. They see a person walk onto a stage, answer a hostile question, absorb a hit and decide—sometimes in seconds—whether that person looks capable of handling power. Trump knows this instinctively. Long before he entered politics, he learned that audiences read confidence before they process detail.

The suit, the posture, the timing and the willingness to own a room all communicate a message. A candidate who looks nervous while delivering a perfect answer may lose to one who looks certain while using ten words. The Associated Press documented Trump applying the same visual shorthand to other Republicans, praising candidates who appear strong, polished or made for the part.

Trump recently praised Ohio Senator Jon Husted’s build and college-football background, while telling audiences that Georgia candidates Mike Collins and Rick Jackson looked like men ready for the job. He uses the same weapon against opponents, comparing Georgia Democrat Jon Ossoff to Pee-wee Herman and Texas Democrat James Talarico to the Alfred Neuman character from MAD magazine.

Gallrein’s biography also gives Trump something more substantial to sell. He served as a Navy SEAL officer, returned to Kentucky and ran as an America First ally. Trump’s compliment worked because it reinforced an existing story about discipline, toughness and command. That is why the rally mattered more than the line by itself: Trump presented Gallrein as the kind of Republican who looks ready to fight.

Trump understands the brutal first rule of electoral politics: Before voters can believe your plan, they have to believe you. In an age of five-second clips, hostile interviews and elections decided by vibes as much as policy, that may be less shallow than it sounds.