People have been reporting about suspicious "doings" and problems when voting.
If you see something, there are several things you can do.
1. Fox News has an email address to send your complaints
We would imagine they are one of the few news outlets that will look into voter fraud.
2. There is a cell phone App, which you can download.
You can send them your findings, including photos,
and we have read that they will look into it. (hat tip Janis)