A political season with many candidates hoping to distinguish themselves in the race for their party’s nomination has created little light but a great deal of heat in American discourse. Most of the smoke of the campaign is traveling well north and west of here (the New York State federal primary election is not until April 18). Yet many artists on the South Fork and farther afield have taken note of the acrimony, and their reactions now hang at the White Room Gallery in Bridgehampton.