WASHINGTON — Speaking last week at a conference on dropout prevention a few miles from his new Congressional office here, Representative Joaquin Castro, Democrat of San Antonio, cracked a self-deprecating joke. “In case you’re wondering,” he said, “you’re not talking to the mayor of San Antonio.”
He may need new material.
Mr. Castro, 38, is accustomed to being mistaken for his one-minute-older identical twin, Julián Castro, a rising political star who last summer became the first Latino to deliver a keynote address at the Democratic National Convention. In the two months since Mr. Castro, a lawyer and former state legislator, was sworn into Congress, he has been the twin receiving the larger share of attention.