The first page of Google results:
Free Republic blog about the evils of felons who are registered Democrats (not that they actually vote)
Palm Beach Post article about felons who haven't had their voting rights restored, but voted anyway. It begins
Of the 8 voters, 5 are Democrats, 3 are Republicans.
LA Times article from 2004 that a Democratic group was using felons to register new voters - not that the evil doers were casting ballots themselves.
A discussion on the
Thom Hartmann website about why so many felons are Democrats.
A link from Yahoo Answers which is slightly flawed.
Paper titled "The Politics of the Restoration of Ex-Felon Voting Rights: The Case of Iowa"
A link from
Faux News repeating a discredited report from "Minnesota Majority" that felons gave the 2008 US Senate election to Al Franken.
An article from
Sound Politics.com repeating that felons are registered Democrats.
An article from
The Daily Beast about how convicted felons are disenfranchised twice by not being able to vote.
That's page one. I guess if I continued to later pages I might find articles about the "long running, expensive, continuing effort to expand the franchise" but I don't really see a need to. But thanks for your concern about us being "truly interested" in the evil things our party is up to.