politic, politick

Politic or politic means shrewd, wise, artful, tactful, or a combination of these--
That comment he made to the boss was hardly politic.
He is politic even when annoyed; I'm sure he can help with this.

Politic may describe something related to voting, most commonly in the phrase "body politic"--
He's just the candidate to appeal to the body politic.

Politick or politick means to engage in campaign or election activities, such as campaigning, making speeches, or asking for support--
He plans to politick across the county this week, wherever there are undecided voters.
Old-time ward heelers used to politick by buying drinks in every saloon.

Now that you know that, you can say--
"Don't let him politick without an aide, one who can remind him to keep his remarks politic."