The character in both cases uses his sexual charm to manipulate a liberal journalist towards illiberal ends. The American wife runs a fake philanthropy with more interest in its own growth than in being a benefit to humanity. The British wife is obsessed with securing a comfortable pension for herself after her scheming husband's demise. In both versions, the wife are happy that her husband uses his stud appeal in the interest of family gain.
The story line on both sides of the "pond" is pretty much the same. The political gamer pulls strings and levers to manipulate his colleagues to his own advantage. Since British and American strings and levers differ a bit, the stories vary accordingly. Both share in the basic framework of intrigue, conspiracy, and brutal tragedy.