Because the majority of American citizens feel that our politicians have ceased to be "for the people", and do not embody the true spirit of our Founding Fathers' idea of "Senator" and "Congressman", they should no longer be considered by those monikers. Their office titles should reflect their true nature and political ideology- that of "Douchebag" and "Rectal Discharge".
We the people have become so disenchanted by the people who assume those House positions. Their lack of productivity for a better America, their use of taxpayer money for personal leisure, bought votes- these people have not earned the titles that were once held in respect. Why not call them by terms to reflect the joke that their offices have become?