"If you want a friend in Washington, get a dog." That's how Harry Truman downplayed the importance of friendships in politics. But at a certain point, do poor personal relations impede a president's ability to get things done? On today's Morning Joe, after rolling a clip in which Donald Trump called Ted Cruz a disliked and "very nasty guy" who can't make deals, a discussion ensued as to whether Cruz's personality would be an impediment to his effectiveness as president. Joe Scarborough was particularly harsh in his assessement, saying "it's one thing being an outsider; it's another thing being a...