WASHINGTON – President Barack Obama said he was setting clear and unmistakable terms for the U.S. role in Libya: It would be limited, lasting days, not weeks, and its purpose was to protect Libyan citizens. But that's not the way it's turned out. Less than a week later, the mission has been clouded by confusion and questions about who's in charge and who's doing what — all while the killing of civilians is going on. The Pentagon claims success in establishing an effective no-fly zone over much of Libya that has grounded Col. Moammar Gadhafi's aging air force. But Gadhafi's...