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She has taken lessons in Irish step dance at a school in South Boston. She has tested her jokes on the staff in her Senate office and family at home. An aide has pored over videotapes of past hosts, studying their moves like a football coach preparing for the big game. Senator Linda Dorcena Forry says she wants to uphold, not upend, tradition when she takes the stage March 17 as the first woman, first Haitian-American, and first Dorchester resident to host the storied St. Patrick’s Day Breakfast in South Boston. Yet Dorcena Forry also made clear she wants to put a fresh stamp on the breakfast and raise the profile of a historic political roast that in recent years seems to have lost some of its luster.