Jubilee and ODM supporters on Tuesday clashed on several social media forums ahead of Nyamira gubernatorial petition ruling.
Governor John Nyagarama (ODM) risks facing a by election following a case that was filed by Walter Nyambati after August closely contested election.
At Nyamira Politics WhatsApp group, rivalry between the two factions was evident with each side predicting victory.
"We are going back to ballot and time to reclaim Nyamira is here. This is no longer an ODM zone," said Nick Kibeni, a Jubilee supporter.
ODM strategist Nyambega Gisesa: "Jubilee should forget even winning the petition leave alone the by election. We shall defeat them no matter what."
On Wednesday, Justice James Makau will be delivering a ruling, that is also closely monitored by both two parties at a higher level.
Last year, President Uhuru Kenyatta insisted that he is confident that Jubilee party will successfully challenge the loss.