verifiedvoting.org looks like a good resource for taking action. If you're interested in learning more about verifiable/auditable voting systems, Wikipedia has some useful references:

https://en.wikipedia.org/wiki/End-to-end_auditable_voting_sy...

I also found this slide deck from Ron Rivest interesting:

Auditability and Verifiability of Elections ACM-IEEE talk March 16, 2016

https://people.csail.mit.edu/rivest/pubs/Riv16x.pdf