The surprise selection of Donald Rumsfeld to head the Bush Pentagon hasn't changed the betting for the No. 2 slot as Richard Armitage, a former assistant secretary of defense, is still widely viewed as the favorite, according to defense experts. Armitage, who now heads his own consulting firm, has been close to the campaign of President-elect Bush and is also close to retired Gen. Colin Powell, who has been nominated for secretary of state. Armitage was the assistant secretary of...