spring cleaning in outer space. the crew of the space station "discovery" docked saturday to perform maintenance and repairs. the big tasks include adding a new room, a robot and some spare parts. this is "discovery's" final voyage. when it returns to earth on witness, it will be retired and displayed in a museum. whether it's polling or the jobless rate, politics often comes down to a game of numbers. this week, we saw a little identity both with voters sizing up the president's economic leadership as unemployment dropped to its lowest level in years. jonathan is an msnbc political analyst and national affairs columnist, as well. let's get to the latest nbc news/"wall street journal" poll that shows people are feeling pessimistic about the future of the economy.