"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Their rationale of the left is obvious. The believe that impeachment hearings during the campaigns will generate so much bad publicity for the GOP, the party will lose the election. But the voters would see an impeachment attempt for what it is: a politically-motivated ploy to influence the election.