WASHINGTON — Arriving at the National Mall after a 30-state bus tour, Eliseo Medina on Wednesday got a crowd of immigration reform supporters roaring “si, se puede” and “yes, we can” in Spanish, English, Korean and Vietnamese.

The retired labor advocate is the acknowledged national leader of an effort to persuade Congress to pass a comprehensive bill with a path to citizenship for the estimated 11 million immigrants living in the country illegally...

The two-hour rally featured a variety of religious leaders who said their faith demands reform. Jim Wallis, founder of the evangelical Sojourners, described how Catholic Cardinal Sean O’Malley, archbishop of Boston, held a mass at a border fence in Arizona this month and called immigration reform “another pro-life issue.”