From the 80 or early 90s at the latest.
I could have sworn the son was played by Matthew Broderick, but I don't see it on his IMDB page. It's definitely a Broderick-like role. The son had been sent to boarding school when his father was elected Senator, where he was a troublemaker. Then his father, who was seeking to appeal to traditional-values voters, brought his son home as part of a reelection campaign to project himself as a family man. Naturally, the son continued to be a troublemaker and all kinds of hillarious eighties comedy hijinks ensued.
Random details: his mother (maybe step-mother) was a highly obnoxious vegetarian, he dated a girl from a working-class family to the consternation of his family, and the Senator's campaign runner was actually trying to sabotage his campaign. I think that's the real reason they brought the troublemaker son home.