The latest opinion poll by research firm Infortrak Harris indicates that Prime Minister Raila Odinga remains the man to beat in the 2013 presidential contest.

The outcome more or less tallies with the one released earlier by research firm Ipsos Synovate. So the big question is: how is it that Odinga remains the top contender in the Kibaki succession yet the key politicians who stood with him in 2007 have deserted him? How is Odinga ahead of the pack, notwithstanding the wave of exodus from the Orange Party?

Francis Gachuri examines this issue, on this week's edition of the Kibaki succession series.

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