Ombudsing is hard.
Democrats took no Abramoff campaign money. None.
Taking money from Indian tribes is not in and of itself illegal or unethical. Indian tribe money is not implicitly dirty money.
Taking money from Indian tribes who were bilked and cheated by Abramoff does not mean that you yourself are guilty of bilking or cheating those tribes.
This stuff is not complicated. It's very simple. People working in Washington for a long time certainly undertand these things. Why they pretend to not understand them is a mystery.