They are. For example Seattle has a council member from the Socialist Alternative party. There are a few Democratic congress representatives that are socialists (both in state and national level). Some socialist policies have successfully been pushed by socialist party members (e.g. the current medicare for all bill has around 100 democratic house members backing it up).
However the confinement of the current democratic system in the USA today simply doesn’t allow for third parties to gain national traction. There are mathematical models that proves this fact. For the real left to get socialist parties to the national assembly some democratic reforms needs to happen first.
However the confinement of the current democratic system in the USA today simply doesn’t allow for third parties to gain national traction. There are mathematical models that proves this fact. For the real left to get socialist parties to the national assembly some democratic reforms needs to happen first.