Some recent polls place Mr. O’Rourke at third in popularity among Democrats expected to be in the race, behind former Vice President Joe Biden, who has not yet announced his intentions, and Mr. Sanders.
Marta Lopez, 71, a retired state worker from El Paso, had come to the rally wearing one of the BETO T-shirts. “We’ve lived here all our lives, and I feel we don’t need a wall,” said Ms. Lopez, adding that she admires Mr. O’Rourke’s positions on immigration as well as his decision not to accept PAC money.
Mr. O’Rourke was to be joined at the rally Saturday by his wife, Amy, and their three children, as well as Representative Veronica Escobar, his successor in the House of Representatives.
Since announcing his candidacy on March 14, Mr. O’Rourke has spent much of his time on a listening tour around the country.
He has made immigration issues a central focus. At a recent appearance in Milwaukee, he spoke about the harmony of El Paso’s multicultural environment and added,“We have nothing to fear from immigrants from, really, anywhere in the world, but certainly those that arrive at our southern border.”
For his campaign kickoff, Mr. O’Rourke chose a location just over a mile north of the Paso del Norte International Bridge linking the United States and Mexico.
The crossing has emerged as a flash point in Mr. Trump’s efforts to seal the border. Faced with hundreds of refugees trying to enter the United States daily, border agents have begun holding the migrants in a makeshift pen beneath the bridge. Mr. O’Rourke visited the bridge earlier in the week.