The DNC as a whole have been trying to remove PACs and undo Citizens United, which alone would gut Netanyahu's influence in the USA.
EDIT: Since this is somehow controversial, the AIPAC is a pipeline of campaign funding directly from Israel. Democrats have on several occasions pushed bills that would overturn citizens united which fail to pass both chambers of congress including HR1 For the People Act
If they punlicly declared that they consider AIPAC a foreign influence agent, stop taking their money and start investigation for how it is a foreign influence agency, they wouldnt need to change any laws.
They could have madea point of how they had enough and how the Reps are selling out the US to foreign influence. Instead they still take the money happily.
Semantics but I suppose its fair criticism of my poor wording. The direct source of AIPAC funds comes from American Donors, and how or when those organizations or inidividuals got the funds isn't publicly disclosed.