They voted on campaign finance caps and limitations in 1995 and 2002 which passed and was sued by Citizens United in 2007 when 5 republican leaning SCOTUS judges struck it down as unconstitutional, and the DNC tried to pass more campaign finance laws recently with HR 1 For the People Act in 2019 and 2021 and again as Freedom to Vote Act in 2021 and 2023.
So yes, the DNC have actively attempted to pass campaign finances for over 20 years. That's a core part of their platform.