My kids are 10 and 12. I do not bring up politics with them yet. I'm not interested in destroying their childhoods with fears of things they cannot control, or trying to indoctrinate them into a specific partisan viewpoint.
I try to set a moral example for them to follow, and use any opportunity I can to teach them how to discern good information from bad information, knowing that if I can do those things then they will naturally lean progressive when they are old enough to decide for themselves.
That said, if they ask a specific political question I will answer it honestly and explain my reasoning. When extended family members or friends bring up politics during a gathering I have discussed whatever issues are broached openly in front of them. Who knows how much they were paying attention to any of it, but they are aware that my wife and I hate Trump.
My wife is mostly apolitical, but she hated Trump the moment he announced he was running for president. She's also heard me complain about Republicans enough that she now votes straight Democrat in every election, and asks me advice about any ballot measures so she doesn't have to waste time researching it herself.
On the rare occasion that trump becomes a discussion topic it's pretty clear my kids think he is pretty stupid. My wife once asked my then 6yo daughter if she thought drinking bleach was a good idea to fight infection just to prove the 6yo was smarter than Trump.