Politico reports President Obama acknowledged that air strikes could last as long as Qaddafi continued to stay in power in Tripoli:

“As long as Qadhafi remains in power — unless he changes his approach provides the Libyan people the opportunity to express themselves freely and there are significant reforms by the Libyan government, and he steps down — there’s still going to be a potential threat to the Libyan people,” Obama told reporters at a news conference here, his final stop on a five-day tour of Latin America. “We will continue to support the efforts to protect the Libyan people, but we will not be in the lead.”