This is from an on-line comment by Peter from Cambridge, MA on a NYT editorial "Jeff Sessions had no choice".
 
"Look at criminal indictments and convictions of executive branch officers, since 1968, by party:
Democratic administrations 20 years
3 indictments, 1 conviction, 1 imprisoned
Republican administrations 28 years
120 indictments, 89 convictions, 34 imprisoned"

The numbers are striking.  I wonder if they are correct?