Politifact says Obama didn't campaign for him, Factcheck says Obama didn't campaign for him, Snopes says Obama didn't campaign for him.
So I say, what am I supposed to believe -- two pictures of them standing next to each other? I'm sorry I'm holding myself to something approaching a standard of evidence here.
BBC - Odinga claims he is Obama's cousin.
API - news article stating Obama campaigned for Odinga.
Read it and weep.