In writer-director Jason Reitman's "Labor Day," everybody is sweaty. Is it because this weekend - a long three-day holiday weekend in 1987 - is particularly warm? Or has the heat from the characters' hot, steamy metaphorical peach pie created its own warm front? My theory? It's because all of the obviously talented actors and actresses in "Labor Day" are trying so incredibly hard to make this overheated melodramatic romance work.