Logrolling is a political strategy used by politicians in the United StatesCongress. Basically, politicians use a "you scratch my back, I'll scratch yours" mentality. Politicians include in a bill they are creating clauses that will be helpful to other politicians. So a representative from New Hampshire who wants a new complex of highways built with federal funds will include in his bill a clause to build a new roadway in Arizona. Politicians, especially from the House of Representatives, have to bring home proof to their constituents that they are benefitting them. So as they attempt to pass bills that will bring revenues or improvements to their state, they also have to bargain with other politicians. It is perhaps because of this reason that so much excess is wasted by the government.