Cloak and dagger? It's literally just applying for positions of lower power to help influence systems to open the gates for higher levels of power. It's... normal everyday shit.
If there were "enough" socialists we'd either have a valid third party or we'd be able to democratically take over DNC primaries. So far that hasn't materialized.
Given there are other countries, like the Nordic countries, that have achieved greater quality of life for their people through democratic socialist means... yeah I'd much prefer that approach than a full on revolution led by some vanguard and the horrendous amount of risk that entails.