San Antonio Mayor Julian Castro was plucked from relative obscurity to give the keynote address at the Democratic National Convention Tuesday night.

The 37-year-old quickly showed America why.

Earning rapturous applause, the party’s first-ever Hispanic keynote speaker called the American dream “not a sprint, or even a marathon, but a relay.”

“Our families don’t always cross the finish line in the span of one generation … but each generation passes on to the next the fruits of their labor.”

For nearly 20 minutes Julian Castro made the case for President Barack Obama’s reelection while arguing time and again that Mitt Romney “doesn’t get it.”

Castro praised Obama’s support for Pell grants, the DREAM Act and more broadly, the belief that opportunity today is the prosperity of tomorrow.

Obama, he said, “understands that when we invest in people we’re investing in shared prosperity, and when we neglect that responsibility, we risk our promise as a nation.”

Romney, meanwhile, he painted as an out-of-touch “son of privilege.”

“Some people are lucky enough to borrow money from their parents, but that shouldn’t determine whether you can pursue your dreams,” continued Castro.

“Not here, not in the 21st century. I don’t think Governor Romney [means] any harm. I think he’s a good guy. He just has no idea how good he’s had it.”

U.S. Presidential Election 2012:

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Julian Castro DNC Speech: San Antonio Mayor Defends Obama, Casts Romney as Candidate of "No"