have a horse in the race
US /hæv ə hɔrs ɪn ðə reɪs/
UK /hæv ə hɔrs ɪn ðə reɪs/

1.
to have a personal interest or stake in the outcome of a situation or event
:
•
Of course he supports the new policy; he has a horse in the race because his company will benefit.
•
As a journalist, you shouldn't have a horse in the race when reporting on political campaigns.