All the King's Men (2006) on Netflix

In the 50's, in Louisiana, the smart populist, manipulative and wolf hick Willie Stark is elected governor with the support of the lower social classes. He joins a team composed of his bodyguard and friend Sugar Boy; the journalist from an aristocratic family Jack Burden; the lobbyist Tiny Duffy; and his mistress Sadie Burke, to face the opposition of the upper classes. When the influent Judge Irwin supports a group of politicians in their request of impeachment, Stark assigns Jack to find some dirtiness along the life of Irwin, leading to a tragedy in the end.