Now watch the companies chaff clouds
"We take the security of the democratic process very seriously"
"Your vote is important to us"
"These were old machines which were retired because there were insecure"
Yadda, yadda.
"Voting machine" is the very definition of single purpose, embedded, niche system. It's got one key task to carry out. It's OS should be pretty stripped down to begin with and how big should the application it runs need to be FFS?
This is a story that deserves to be more widely reported.