Kanu and Jubilee Party are set to battle it out for the Wajir West parliamentary seat on Thursday.
The contest pits Kanu’s Ibrahim Mohammed against Jubilee's Ahmed Kolosh, in what has been interpreted in some quarters as a battle between Rift Valley political bigwigs Deputy President William Ruto and Baringo Senator Gideon Moi.
The seat fell vacant after the Supreme Court nullified Mr Kolosh’s election over irregularities at the Qara polling station.
Mr Kolosh, who had run on an ODM ticket, decamped to Jubilee and was welcomed by the DP.
Dr Ruto's hand was also seen in the withdrawal of the ODM candidate for the seat, Prof Mohamed Elmy.