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Depends on the politician. Extremist politicians like Trump are a no-go. Those supporters can't be convinced as they already believe fairytales. I'd say have fun, you do you, I'm out. This is the biggest problem with 2 party systems, you only get to choose between bad options.
Here we have multiple parties (to many for some) and you can vote for a party with you agree most instead for the one you disagree least with. When somebody wants to vote for a party you don't agree with, you ask why, as we have (almost) no 1 issue parties and most party programs are pretty consistent on the usual issues and programs overlap a lot. When they say they vote for party x because of point 1, when not to extremist (immigration, killing off fossil dependencies no matter the costs, unlimited market,...) there will be at least 1 other party with the same view but less 'colleteral damage'.
On the other hand, extremist views, especially in a multi party environment are limited to a minority, so will never get to power. Other, valid, views are adapted by other parties, so people aren't limited to the extremist.
