A few feet from Chris Christi's desk in the Governor's office, sat an aide who sent an order to a Christi appointee, at the Port Authority, to cause traffic problems in Ft. Lee, N.J. Since, Mr. Christi proclaimed his innocence because he was ignorant of something occuring a few feet from his desk, he is able to run for the Republican Presidential nomination.
Another such Presidential candidate, Scott Walker, sitting inches from an employee, who was illegally soliciting funds for Mr. Walker's campaign and is serving a prison sentence on her felony conviction, also claimed ignorance of what was going on and is one of the front runners for the nomination.
To be fair, the Republicans do not automatically accept ignorance as a defense. When the Internal Revenue Service, a quasi independent branch of the Government that was then being run by a Bush appointee, delayed issuing some tax exemptions, to the Tea Party, Republicans insisted that Barack Obama was guilty of malfeasance in office, regardless of whether he even knew about it at the time, because, after all, it happened on his watch.