Uganda's constitutional court has dismissed long-running treason charges against the country's top opposition leader.
The court's decision Tuesday could allow Kizza Besigye to challenge President Yoweri Museveni in 2011 elections.
Justice Alice Mpagi Bahigeine said the five judges ruled unanimously that the evidence was insufficient to continue the case.
Besigye was Museveni's strongest challenger in 2006 elections. After the elections, the government said he and others "contrived a plot" in 2001-2004 to overturn the Ugandan government by force.
Museveni led an insurgency and took power in 1986 but was voted into office for the first time in 1996. In 2005, parliament voted to remove presidential term limits, allowing him to run in 2006.