San Antonio Mayor Julian Castro, a rising star among Democrats, is poised to make history Tuesday as the first Hispanic to deliver a keynote address at the Democratic National Convention.

The 37-year-old official, who was re-elected in a landslide victory last year, is expected to present himself as a classic American success story -- with a family narrative that begins with his grandmother, a Mexican orphan, who immigrated as a young girl to the U.S. in 1920 and taught herself how to read and write. Castro, the youngest mayor of a big city, has also hinted that his speech Tuesday will be heavy in defense of President Obama's record. 

"I’ll be talking about my family’s story," Castro told Fox News. "And that more than anything else, my family’s story, and the story of so many families across the United States from different parts of the country represent an American dream story."   

Read more at Fox News Latino