ACM (Association for Computing Machinery), one of the international professional societies, has a group, called "RISKS", that monitors and keeps track of "Risks to the Public in Computers and Related Systems".
In the March 2004 issue of ACM's Software Engineering Notes, there is a summary of issues relating to the risks and problems with Electronic Voting. The RISKS group is able to study the problems and make recommendations, but has no power to modify the voting systems.
Here are some of the known issues. The links point to the original article in the RISKS digests. These articles contain further references to the original sources of the reports. All of this information is verifiable!