You don't change horses in the middle of the race.

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You don't change horses in the middle of the race.

It is dangerous or inadvisable to choose or back a different political figure for an election after the decision has already been made or the position filled. Many people are dissatisfied with the senator's performance but will likely carry his party's support through to the next election—you don't change horses in the middle of the race, as the saying goes.
See also: change, horse, middle, of
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