It may be bursting. And Robert Samuelson rightly piles on: As a journalist, I harbor serious doubt about each of the most likely nominees. But with Sens. Hillary Clinton and John McCain, I feel that I'm dealing with known quantities. They've been in the public arena for years; their views, values and temperaments have received enormous scrutiny. By contrast, newcomer Obama is largely a stage presence defined mostly by his powerful rhetoric. The trouble, at least for me, is the huge and deceptive gap between his captivating oratory and his actual views. The subtext of Obama's campaign is that his...