This is a truly excellent and overlooked Redford vehicle, and his performance comes full circle. From wide-eyed idealism to resigned cynicism, all the way back to little-boy-lost and overwhelmed. Redford is flawless! Peter Boyle is right-on as the experienced campaign hand. Also it is easy to overlook Don Porter's effortless portrayal of the smooth and experienced incumbent senator, just on the verge of decline. Porter's seamless delivery makes it look easy.
Douglas is also excellent as John J. McKay, Redford's father and the former governor. Obviously a traditional machine politician, and apparently estranged from his activist son for that, and perhaps for other reasons we are left to imagine, Douglas revels in the younger man's initiation to the corrupt world of politics. Catch the hunting scene to illustrate how these two are poles apart.
An intelligent, realistic, and rewarding film about politics, done at a time when folks were perhaps looking for a political fairy tale.