The way this sounds is that you are more concerned about politics as in people who take party positions and may feel excluded as a group when the majority of the community takes a different position. This is a slightly different issue i.e. party politics, and I think it is fine/a good thing, but it is also important to distinguish the two. This should essentially be under the same umbrella as personal attacks, as they are essentially the same thing.
In my opinion, the fix is to mark then as political and give the user the choice to bypass them. Either as a prefix such as in "Tell HN" or to flag it as such via a clickable option. Putting a defacto policy against political news is a bad idea.