Kenya is the lynchpin of East Africa's economy and plays a vital security role in the fight against Somali militants. The U.S. Embassy in Kenya is the largest in Africa, indicating this country's importance to U.S. foreign policy.
The political battle between the families of Kenyatta and Odinga goes back to the 1960s and to the two candidates' fathers. Jomo Kenyatta was Kenya's first president after the end of British colonial rule. Jaramogi Oginga Odinga served as the country's first vice president then. The two later had a falling out.
If a runoff is declared for Odinga and Kenyatta, it would be most likely held in late April or early May, depending on how long legal challenges take.
Associated Press reporter Rodney Muhumuza in Nairobi, Kenya contributed to this report.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.