running mate 
noun chiefly North American
1An election candidate for the lesser of two closely associated political offices.His running mate as vice presidential candidate would also be announced....
- He is his vice presidential running mate for the election in November.
- He is also the son of the vice-presidential running mate of a SEP presidential candidate.
2A horse entered in a race in order to set the pace for another horse from the same stable, which is intended to win.He has a record of 2.15 with a running mate.
- velocipedist
- velociraptor
- velocity
- velocity of circulation
- velocity profile
- omni-antenna
- omniarch
- omnibenevolence
- omnibenevolent
- omnibus
- omnibus box
- omnibus letter
- omnibus man
- omnibus ticket
- omnibus train
- omnicausality
- omnichannel
- omnicide
- omnicompetence
- omnicompetent
- omnidirectional
- omnidirectionality
- omnidirectionally
- omnifarious
- omniferous