I'm hearing reports that people were being told at polling stations in several states that Ron Paul had dropped out and not to vote for him. This is the first evidence I've seen supporting the rumors. Tampered Ballot from NY
Pretty hard to believe in Democracy when you follow the NH Republican recount, with broken seals, broken rules, chain of custody issues, and the massive discrepancies between machine and paper voting.
Right now, I believe that folks in the right positions at the local level will do everything they can to swing the elections in whatever direction they favor. I don't believe there is a grand, coordinated conspiracy, but I do believe that Republicans and Democrats will both be using whatever dirty tricks or fraud they think they can get away with to influence (or steal) votes under their control.