A quote about Beto running for office from dailykos.com:

But what caught my attention immediately was something that he said in the portion of the speech that was aired yesterday on MSNBC. He quipped that “There were 13 candidates in the race right now, and no, he probably couldn’t name them all off the top of his head right now,” which evoked honest laughter. But it was what came immediately afterwards that jolted me. He said something like, “And it really doesn’t matter, because any one of them is far superior to who we have in the White House right now. It doesn’t really matter which one of us you like the most right now, what’s most important is that whomever the eventual candidate is, that we all rally around that candidate, because that’s the only way that we can win in 2020.”

Think about that for a minute. On his first day on the campaign trail, not only is Beto O’Rourke acknowledging the simple fact that he may not win, he’s already swearing loyalty to the one that does. And he’s actively planting that seed in the minds of anybody who hears him, regardless of which candidate they currently back and support. And that message is, “Be passionate for the candidate of your choice. But when this is all over, put that passion behind whichever candidate wins the nomination, because that’s the only way we can beat Trump. And Beto O’Rourke is exactly the kind of hopeful, youthful, energizing candidate that these people fell in love with in 2008 and 2012.