Hyde Park on Hudson is a 2012 film based on the diaries/journals of Daisy Suckley, in which apparently being a clueless adulteress makes you the hero of the piece. Excuse me while I'm not won over by the idea. The Wikipedia article says Daisy's writings are the only evidence of any kind of such a relationship, although relationships with other women were known.
Bill Murray plays F.D.R.
Empire Online gives it 2 out of 5 stars, concluding, "Disappointing given the talent and situation, dull as ditchwater and historically suspect, another The King’s Speech it definitely is not. Nice costumes, though." TimeOut gives it 3 out of 5 stars, calling it "somewhat uneven and ultimately underwhelming". EW gives it a grade of C-, calls it "tittery" and says, "nothing in those letters justifies the handwork that Laura Linney, as Daisy, performs on Bill Murray as FDR". Roger Ebert gives it 3 1/2 out of 4 stars and says, "Murray, who has a wider range than we sometimes realize, finds the human core of this FDR and presents it tenderly." Rotten Tomatoes has a critics rating of 36% and an even lower audience rating.