slate.com — Matt Romney is back home from his three-country world tour, and the question must be asked: Has any presidential candidate—has any American politician of stature—splashed in so many muddy puddles along the way? Does the candidate believe the things he says? Has he thought through their implications? Or is he simply pandering to the audience of the moment? In other words, is he shallow, or is he cynical? It’s an important question for someone who’s campaigning hard to be president. Romney took this trip to pass a fairly simple test: to demonstrate a bedrock comfort and competence on the world stage. He failed that test, so he should at least be clear about another trait worth knowing about a presidential candidate: his beliefs. In Romney’s case, it’s still a mystery what they are.