What is the difference between a Republican and a Democrat?

That's Senator Everett Dirksen in 1967. His name turned up on the blog yesterday, and it put me in the mood to hear his once-familiar voice. I wanted to be reminded of how people talked back then, when — perhaps! — Senators were Senators. Or, anyway, when I was growing up, his image and voice were the very embodiment of the word "Senator."