As 2007 progressed the coalition proved unstable, with various factions defecting. Uhuru Kenyatta's KANU was the first, pulling out in July 2007 and endorsing President Kibaki's re-election, although some individual KANU politicians stayed with the ODM. Then, due to an internal rivalry between Kalonzo Musyoka and Raila Odinga, the ODM split into two factions in mid-August 2007. Raila's group, which also included Musalia Mudavadi, William Ruto, Joseph Nyagah and Najib Balala defected from ODM-Kenya and took over the ODM party registered by Mugambi Imanyara, while Kalonzo's group, led by himself and Dr. Julia Ojiambo remained in the original ODM-Kenya.