You're replying to a post describing the terrible effects of US sanctions on Iran. Imagine if you were living under those conditions, and person from the country enforcing the sanctions responded that there's nothing they can do because their two party democracy makes it too hard to change anything?
This is not the right place to complain about political gridlock in the US.
Why? If a person from Iran comments and says, I don't actually want to destroy the US but I can't really change it because XYZ.
Granted the post is a bit thin and doesn't go beyond the surface level of the issue, but its is relevant information for an outsider.
Given this is the US we are talking about most people probably know about the two party system and so on, but foreign relations is a special case even within that. My responds provides some more context to the problem pointed out.
Of course it's horrendous and completely disheartening but it does not make it not true, and I think it's important to inform that the answer is not 'voting'. Voting does nothing with a non-functioning government.
This is not the right place to complain about political gridlock in the US.