If I'm understanding the indictment right, these are elections for low-level judgeships:
>On or about May 19, 2015, Domenick J. Demuro, and others known and unknown to the grand jury, added 40 fraudulent ballots during the primary election in the 39th Ward, 36th Division, on behalf of defendant MICHAEL "OZZIE" MYERS' client candidates running for Judge of the Court of Common Pleas in the First Judicial District of Pennsylvania, and on behalf of defendant MICHAEL "OZZIE" MYERS' preferred candidates for other state and local offices.
(this is just one incident on the list). I don't know what the campaign budget for a Judge of the Court of Common Pleas is, but I suspect it's not that high if they're willing to bribe someone for an extra 40 votes!