I have no idea as to whether Rove was up to vote-rigging tricks this year (although I’m totally convinced that the Republicans pulled something off in Ohio in 2004).
Seems to me that if it’s true, and Anonymous *is* holding evidence, there’s little upside to Anonymous releasing it:
Thom Hartmann jumps on “Anon. foils Rove’s e-Vote rigging in OH” – link to Hartmann’s vid by 99th_monkey
Anonymous Claims It Stopped Karl Rove From Hacking The Election By Hacking ORCA – Wonkette piece repost by ehrnst