What happens when those considered “good guys” aren’t really all that different from the “bad guys”? "Posse," released in 1975, stars Kirk Douglas and Bruce Dern in a Western exploring this very question. Douglas portrays Nightingale, a marshal campaigning for Senate in West Texas, while Dern plays Strawhorn, an outlaw leader whom Nightingale wants to capture to boost his political prospects. Bo Hopkins appears as…