In a presidential campaign already noted for partisan acrimony, San Antonio Mayor Julián Castro might seem an odd choice to deliver the Democratic Party’s signature address Tuesday night in Charlotte, N.C.

The Obama campaign is putting forward the 37-year-old second-term mayor, who has never run in a partisan election and has built bridges to his hometown Republicans.

Mr. Castro’s plum speaking slot is testament to two realities: the centrality of the Hispanic vote for President Barack Obama’s re-election chances; and Mr. Castro’s own status as a rising star within the party.

When Mr. Castro takes the stage, introduced by his identical twin, Joaquin, who is running for the congressional seat that represents San Antonio, he will be the first Hispanic to deliver a convention keynote speech.

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