glad-hander

An excessively friendly person, typically a politician, who greets another effusively but insincerely usually in an attempt to gain an advantage.

Roger Simon: “Joe Biden is a glad-hander in the best sense of the word: He looks glad to be grasping each person’s hand, looking the person in the eye, answering some question or exchanging some pleasantry — ‘You’re going to a wedding in Delaware? What hotel? You’re kidding! I live four miles from that hotel!’ — and then, spying the next person down the row, saying, ‘I’m coming for you! I’m coming!'”