Power (1986)

Pete St. John is a powerful and successful political consultant, with clients spread around the country. When his long-time friend and client Ohio senator Sam Hastings decides to quit politics, he is rapidly drafted to help with the campaign of the man destined to succeed him, unknown and mysterious businessman Jerome Cade. In parallel and unaware of the potential dangers, he proceeds to unravel the mystery surrounding Hastings dropping out with the aide of his ex-wife, a prominent Washington-based journalist. But interests more powerful than local arm wrestling are at stake and things start getting awry.