Voters cast their ballots in Kenyan presidential election with low turnout

The first voters in the Kibera slum in Nairobi, Kenya, look into one of the many polling rooms at Olympic Primary just minutes before voting commences on Tuesday. (Nickolai Hammar/NPR)

Kenyans headed to the polls on Tuesday in a presidential election pitting a veteran opposition leader against the sitting deputy president.

In a twist, outgoing Kenyan President Uhuru Kenyatta, who isn't running for reelection, threw his support behind his longtime rival, Raila Odinga, instead of his own deputy, William Ruto.