Well, let's see.
I don't know enough about Graham (Cracker) to comment on him other than making fun of his name.
McCain cost the tax payers at least one, possibly more, multi million dollar aircraft and has been living off the US tax payer since the day he enlisted.
Benedict Arnold fought several battles without pay helping to defeat Gen Burgoyne at Bennington/Saratoga, then sold inaccurate plans of West Point to the British.
I'm thinking McCain is the most expensive anyway.