The Radio Africa opinion poll was conducted by phone between June 24 and 28 and carries a margin of error of plus or minus 4.4 per cent. The poll contacted 500 adults living in the five wards of Kiambaa.
Both Jubilee, aligned to President Uhuru Kenyatta, and UDA, aligned to Deputy President William Ruto, have plunged considerable resources into the Kiambaa campaign.
For Jubilee, it is considered a must-win election after the humiliating loss of the Juja seat in May, while a win for UDA would make Ruto the front-runner for the August 2022 presidential election.
Kanu decided not to field a candidate in Kiambaa so as not to undermine the potential vote for Jubilee.
The by-election for the Kiambaa constituency in Kiambu follows the untimely death of the sitting MP Paul Koinange from Covid-19 in March.