HARTFORD —— Until Tuesday afternoon, the future was looking grim for Mariano Cardoso Jr. Brought to this country illegally by his parents when he was a baby, the 23-year-old Capital Community College student was facing imminent deportation to Mexico, a country he did not know. But while at school Tuesday, Cardoso got a call from Sen. Richard Blumenthal, D-Connecticut, telling him that federal immigration officials had granted a rare stay of deportation and that in all probability he will be able to remain in the U.S. indefinitely.