Risk-limiting audits (the topic of this thread) are all about how to improve security with paper ballots. So a reasonable question for someplace that has paper ballots is "when are you going to do RLAs?"

Without paper ballots, we're back in the world of paperless electronic voting systems, which have been shown to have a variety of security vulnerabilities (discussed elsewhere in this Reddit). So a reasonable question for someplace that has paperless electronic voting systems is "when are you going to retire these machines and what's the plan to replace them?"

I'm not aware of any systematic voting machine election interference, at least in any U.S. election in anything resembling the modern era. If you go back far enough in time, you get plenty of well-documented messy elections. The story of "Landslide" Lyndon Johnson's victory in the 1948 Texas Senate Race is pretty amazing.