The democratic wing of the Democratic Party*
who don't take funding from corporate PACs
who are not rich and do not become rich in office
who practice transparency and full disclosure

Which leads to representatives who represent ordinary middle and working class people and not corporations and the super rich.

The democratic wing is not so much an ideology as it is a commitment to the democratic process. It might include some on the left, liberals, socialists and progressives without some of the pejorative connotations. It could also include centrists and conservatives but not those who represent corporations and the super rich.  The democratic wing favors transparency and full disclosure and democratic process in elections and government.