So maybe The Donald is not necessarily looking for an endorsement, he just wants a meet-and-greet, to SHOW that he is, in fact, a real human being, and not the caricature that has been drawn of him.
The Donald is not looking to attract Republicans (though that might not be a bad idea, especially if Republicans can also see The Donald as a human being), and this outreach will not go unnoticed. Many more people are noticing The Donald, and some are forming opinions that, on balance, come out very much in favor of what The Donald is presenting as his message.
-—So maybe The Donald is not necessarily looking for an endorsement-—
Unless the article is lying, his own campaign called the meeting an endorsement...