When Fred Thompson makes his long-delayed entrance into the Republican presidential race, he will not tiptoe quietly. Instead, he will try to shake up the establishment candidates of both parties by depicting a nation in peril from fiscal and security threats — and prescribing tough cures he says others shrink from offering. In a two-hour conversation over coffee at a restaurant near his Virginia headquarters, the former senator from Tennessee said that when he joins the battle next month, he "will take some risks that others are not willing to take, in terms of forcing a dialogue on our entitlement...