Republican Sen. John Ensign (R-NV) was forced to resign in 2011 after he became the subject of a Senate Ethics Committee investigation related to his attempts to cover up an affair he had with the wife of his best friend and co-chief of staff.
1st Day of the 113th U.S. Congress
" If you don't hold us accountable we'll do some real bad things in Washington, D.C."
Maybe this quote is an example of why most Republicans let their other head do their thinking.