CHELSEA, Mass. — It seemed like a given that Mario Rodas would go to college.

The Guatemalan-born student certainly had the academic credentials, going from English as a second language classes to taking advanced placement exams for college credit his senior year at Chelsea High School.

But paying for it was another matter. As an undocumented immigrant in 2005, Rodas would have had to pay out-of-state tuition fees to go to a public college in Massachusetts, and he couldn't afford that. If he had lived in Texas or Utah, states that allow undocumented students to pay in-state tuition rates, Rodas, now 22, might have graduated already.

"Every year we have more and more students in limbo here," Rodas said. "And every year we have more and more students taking advantage (of in-state tuition) elsewhere. I don't understand."

Nearly three years after Massachusetts House lawmakers soundly rejected a bill that would have allowed illegal immigrants to attend college at in-state tuition rates, lawmakers are preparing to revisit the issue.

Activists say 10 other states, some dominated by conservative lawmakers, have passed legislation with bipartisan support, and advocates see no reason why Massachusetts, a state controlled by Democrats, can't do the same.

That has been a frustration for advocates in this left-leaning state, which was the first to legalize gay marriage and the only so far to require health insurance for all its residents.

"Massachusetts is out in front of so many things," said Harris Gruman, executive director of the Service Employees International Union Massachusetts State Council. "But Massachusetts is behind on this."

Undocumented students say they plan to launch a campaign by lobbying key lawmakers and sharing their stories in face-to-face meetings. Meanwhile, activists have cultivated a broader coalition of supporters that includes union members, business leaders and academics — something lacking in 2006.

State Senator Sonia Chang-Diaz, D-Boston, said the state's Higher Education Committee is expected to hold hearings on the matter later this year or early next. Chang-Diaz, a co-sponsor of the bill, says it stands a better chance this time, with increased lobbying efforts and support from Democratic Gov. Deval Patrick. Former Gov. Mitt Romney, a Republican, opposed the measure in 2006.

"Time is our friend here," Chang-Diaz said. "We've had more time to talk to more people collectively ... and get them more comfortable with it."