Brian Snyder / Reuters To be a candidate for high office is to be surrounded by a cacophony of advice. So long as things are going well, most of the advice can be politely disregarded. President George W. Bush used to explain why he disliked traveling with a large entourage: “How many people do I need telling me to be myself?” But when things go south, the advice becomes more insistent, more contradictory, and more dangerous.