Continued from page 1

Some young adults who would benefit from the Dream Act have formed a loose network and have vowed to dog Mr. Romney along the campaign trail. Outside of the Republican’s campaign speech Wednesday, one of the protest organizers, Moises Serrano, said Mr. Romney’s compromise Dream Act isn’t enough.

“The youth here in my community … agreed we will not take any watered-down version of the Dream Act,” he said. “They’re trying to divide and conquer, and they are not going to divide the movement.”

Some Hispanic activists say Mr. Obama will have to answer for his own immigration record. During the 2008 campaign, he promised to win passage of an immigration legalization bill in his first year in office; instead, he focused on economic stimulus, health care and climate change.

Obama defenders said when the election is framed as a choice between Mr. Obama and Mr. Romney, the president will come out ahead on immigration for Hispanic voters.