The voting population doesn't directly control voting machines. I'd say it's a mix between getting a good representative elected, and getting the facts known and actually debated.

(In case you're not from the US: our government is largely a representative democracy, not a direct democracy, with a few exceptions, such as California's proposition system.)

I would say that voting machines are also a niche issue: whether that's good or not, IDK, but most candidates (I feel) would rather discuss their positions on more mainstream topics such as gun control issues, gay rights, abortion, economics issues (particularly vague economic issues), whether or not we should build a wall, etc. Technology is a rare issue, and even rarer to see a candidate demonstrate an understanding of the facts in the issue.