The Capitol Hill appearances of the top U.S. military commander in Iraq and the U.S. Ambassador in Bagdad this week gave the three current White House contenders a focal point - - and on-camera time - - in their elected roles as Senators on the Armed Services and Foreign Relations Committees. And the two Democrats, Hillary Clinton and Barack Obama, continued to scour Pennsylvania for votes in hopes of derailing each other's campaign momentum.  VOA's Jeffrey Young has this week's political wrap-up.