Democrats don't want to let individual states decide for themselves (Republicans for the most part don't want to either). They want national control over as much as they can get.
That is a political problem - totally different (and fixable if people want) than claimed issue that the Nordic model couldn't work in the US because difference in the size of population
That's part of it. The other part is that people are in favor of local control, even down to the most local level--until the local government and/or local voters (especially if it's their government and/or local voters) do something that they strongly disagree with.
