For a guy whose presidency was supposed to be on life support, Barack Obama has certainly had a productive couple of weeks. With his poll numbers sinking toward George W. Bush territory -- 53 percent in a recent CNN survey said he's not a strong or decisive leader -- Obama took bold action on two issues that dramatized the power of the presidency.One was about getting Congress to act, the other about preventing World War III.Most see that if Obama has weaknesses, he also has formidable strengths. Agreeing with Sen. Harry Reid to do away with Senate rules allowing Republicans to filibuster White House appointees took real political courage.