The Best Man (1964)

Intellectual William Russell and down-to-earth Joe Cantwell are front runners for a party nomination that will almost certainly mean the Presidency. Cantwell is prepared to use anything to achieve his goal while Russell sees himself as a man of principle - though his philandering means he is relieved his wife is prepared to appear alongside him. Both men crucially need the support of the ailing President, and as the stakes become higher each team has to decide how dirty they are prepared to get.