For South Fork voters there is really only one choice for Suffolk legislator: Bridget Fleming. Her opponent, Heather Collins, has hardly campaigned and her candidacy appears to be little more than a placeholder for the Republican and Conservative Parties, whose ballot lines she occupies. Ms. Collins is an assistant clerk in the Suffolk County Board of Elections, an office ripe with political patronage. She lost twice to New York Assemblyman Fred W. Thiele Jr. after he switched to the Independence Party. She also has declined invitations to appear at local debates, which all but confirms her as a wasted choice.