Allies of Hillary Clinton are confident she will win the Democratic presidential nomination, but they are worried about one big thing: her likability problem in the general election. Clinton has rebounded from a rough spring and summer with a strong fall. And while her eyes remain on the primary, she is already testing general election themes against her possible GOP opponents as they do battle in what could be a drawn-out Republican primary. Presidential elections are often decided on personality instead of specific policies. Along those lines, people in Clinton's orbit are worried she doesn't pass the would-you-like-to-have-a-beer-with-her test. It's...