Uganda's president and three challengers have presented their nomination papers for the 2011 presidential poll.
President Yoweri Museveni and his main challenger, Kizza Besigye, brought their papers to the electoral commission at separate times Monday and later held rallies in the capital, Kampala.
Museveni has been in power for 24 years. He first seized power in 1986, then 10 years later won his first election.
At the time he was hailed for initiating a program of economic liberalization and openly dealing with the AIDS scourge in his country.
That perception changed when the parliament dominated by Museveni's party voted in 2005 to remove presidential term limits, enabling him to run again.