Myth has it that, late in the mid-1960s, Dan Rather went over to Abraham Zapruder’s house to sock his jaw and take away the home movie he’d made of JFK’s assassination. Rather denies this story, but somehow networks did get a hold of the film and the home video became the best-known record of the day in Dallas. The film shows Jackie Kennedy climbing up onto the trunk of the still-moving convertible, reaching toward a security guard her dress probably already covered in blood. New York based Karen Finley, who performed in drag as Jackie O. at the Broad Museum a week and a half ago, painted stills from that scene on small canvases. They hang in her new show “Love Field” at Coagula Curatorial, among other work exploring Jackie’s look and the Kennedy legacy. One series of drawings depict Marilyn Monroe as Jackie. But the paintings based on the Zapruder film are perhaps most affecting. Something about seeing Jackie’s pink suit and pillbox hat treated so caringly, in inexact paint, makes a historical flash point tender again.