This is an interesting topic.
The US government made available funds to purchase electronic voting equipment which leave no paper trail. They required that states purchase this equipment in the calendar year 2003 in order to recieve this money. They provided a list of approved voting equipment vendors. However none of this equipment can be considered reliable or tamper proof. All remove the possibility of a true recount.
The leader of these three is created by a company called Diebold. Diebold has direct ties to GWB (a transaction regarding the Texas Rangers).
The owner of Diebold has indicated he plans to run for office in the next 8 years.
It seems scary to have a person involved in the programming of a computerized voting system run for office. One single easter egg in the system could change everything.
But even if you don't want to look at the conspiracy aspect of this, the flaws and problems with these systems are ridiculous.
"""We were caught. We apologize for that," Diebold Election Systems president Bobrosevich said of the mass failures of devices needed to call up digital ballots. Poll-workers in Alameda and San Diego counties hadn't been trained on ways around their failure, and San Diego County chose not to supply polls with backup paper ballots, crippling the largest rollout of e-voting in the nation on March 2. Unknown thousands of voters were turned away at the polls. "
http://www.blackboxvoting.org