Morning Buzz: Feb. 20, 2008

Barack Obama racked up his ninth and 10th straight victories last night, defeating Hillary Clinton in Wisconsin and Hawaii. Obama's wins make Ohio and Texas must-wins for Clinton. The two Democratic candidates will debate in Texas tomorrow. John McCain also won convincingly in Wisconsin and Washington State as he continues to press on toward the GOP nomination.

The space shuttle Atlantis landed safely this morning with its seven astronauts on board. The crew had been in space to deliver a new European lab to the international space station. "We're extremely happy to be home," Cmdr. Stephen Frick told Mission Control.

A Navy heat-seeking missile is potentially going to be used tonight in an attempt to demolish a crippled U.S. spy satellite before it falls to Earth. President Bush has already approved the maneuver, citing concern about toxic fuel on board the aging satellite.