Azimio leader Raila Odinga on Tuesday made an impromptu visit to Kenyatta Market in Nairobi.
He was accompanied by Wiper leader Kalonzo Musyoka and his counterparts Martha Karua (Narc) and Eugene Wamalwa (DAP-K).
Others present were former Kakamega Governor Wycliffe Oparanya and former Jubilee Secretary General Jeremiah Kioni.
"We stopped by Kenyatta Market for lunch," Raila tweeted.
In photos shared by ODM on its social media sites, the leaders were pictured having an ugali meal alongside soup and some greens.
He said they also took the time to rally Kenyans to sign the citizen's initiative against the Kenya Kwanza administration and attend Wednesday's rally at Kamukunji Grounds.
Earlier in the day, Raila launched a public website to facilitate the collection of 10 million signatures.