Analysts say the two bring a new perspective on the tickets and magnify the important role played by partners in determining the results of a presidential election.
An important factor is the power of the nominee to organize votes in his or her constituency.
Also emerging is the presidential candidate, in the event that a person becomes vice president and must step in instead of the Head of State - or to qualify as a successor.
The vice president strikes a chord in the presidency and takes over the reins of government if the president is ousted, or dies in office.
In introducing Mr Gachagua as his running mate on Sunday, DP William Ruto described his deputy as an amazing lower-level and politically motivated activist.
To appeal to his “trade” background, he cited the former lawyer as a living example of a real revolution that stemmed from the hardships of the results of the liberation struggle to the culmination of professional, commercial, and political success.
"He (Rigathi) is a fearless fighter for the right reasons, and he is a tireless champion of those who are betrayed, persecuted, oppressed, despised, neglected and looked down upon," he said.
On Azimio's side, Raila's supporters say that choosing a woman as a running partner was not just an eye-opener, but also a message that the times have changed. A Tifa poll this week revealed that Odinga-Karua's ticket was supported by 35 percent of women and 32 percent followed by Dr Ruto and Mr Gachagua.
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