Scott Brown arrives in Washington driving his famous truck, and he looks like a million dollars -- Jimmy Stewart playing Mr. Smith. President Obama polishes his State of the Union Address and suddenly he's looking discounted to more like a few thousand dollars. The two events are not unrelated. The president will speak to the joint session of Congress next week as his approval ratings have fallen from a high of 70 percent a year ago to less than 50 percent, proving once more that in politics nothing recedes like success. At this time last year, Obama was President Possibility,...