Check out this Article from AmericanThinker By J.R. Dunn
This is a “brief history” because the complete history of Democrat electoral malfeasance reaching back to Tammany Hall and Tweed would require four volumes or more. (I’m running into the same problem with a new book I’m outlining analyzing the Democrats as a criminal organization, much like the Mafia or the Camorra.)
So a brief history it is, limited to the past thirty years or so. Believe you me, there’s no lack of cases even in that short span.