This speaks volumes about the attitude of many retiring Democrats in this election cycle. From The Hill:
House Democratic leaders want a going-away present from the members who are leaving Congress next year — their committee dues. A dozen retiring House Democrats have racked up almost $2 million in outstanding balances with the party’s campaign committee while, in some cases, maintaining flush war chests.
They probably understand that funding their party's campaign coffers is going to be futile this year.