From NBC's Carrie Dann and Mike Viqueira For the first hour of the 111th Congress, the nation’s lawmakers were all smiles on the House floor.  Freshmen thrust their hands across the aisle -- literally -- as they introduced themselves to their new colleagues. Representatives of both parties grinned together as they watched their children, who were invited to romp on the floor for the occasion.   But by the time the clock struck three times, things were back to normal.   "Shame on ...