Mwai Kibaki
After return of the multiparty politics in Kenya, Nyamweya joined hands with President Mwai Kibaki, then Minister for Health in Daniel arap Moi's cabinet, to form Democratic Party (DP). He was later to serve as National Vice-Chairman with Mwai Kibaki as Chairman. Nyamweya demonstrated his extraordinary qualities as a tactful politician when he mobilised the DP campaign so well in Kisii during the 1992 elections, which enabled Mwai Kibaki to get the highest number of votes in Kisii in comparison to other presidential candidates.