Originally Answered: Electronic Voting has been shown to be easily rigged? Why do we still not have a receipt for our voting?
Because nobody in elected office wants to rock the boat with regard to voting systems. The companies that make the voting systems find it easier to make ones that do not have printers (printers tend to jam, which is a problem they have to work out) and it's generally cheaper and flashier (easier to sell) to make it electronic as well as less work for the local election commissions, hence they like to make electronic machines without receipts. That puts a lot of lobbying money behind the electronic voting machines, which shaped the "Help America Vote Act", which passed in the wake of the Florida disaster in 2000. The act did not make voting better, it made it much worse, even though it made it more uniform. They forced us here in New York, for example, to get rid of our virtually fool proof ancient level machines that never caused any significant problems. We've already had some issues with our new electronic ballots, after dragging our feet for years, as the last State to come into compliance with that law.
There have been some who pointed out the The President of Deibold, the largest manufacturer of electronic voting machines, stated he would do whatever he could to get Bush reelected. While it's possible he stole the election and it would be very difficult to tell if he did, the far more likely fear is that one lone hacker could alter the outcome of an entire State without leaving any trace. Several experts have demonstrated that this is possible with the current technology used in most States and while there is no evidence it has happened, it would be very hard to prove if it had.
And that's true for either party. But the people elected under that system usually don't want to change it.
EDIT: Uncle Pennybags, you don't take the receipt with you, as another poster pointed out. It is used to do a hand recount in case of a challenge
And if the machines themselves have fraudulent software, that can be traced. The hackers who alter the machines do it by altering the vote count directly and use software that will delete itself after infecting other machines. They can potentially alter an entire voting district, not just one machine or polling place. In the right district, that can alter the entire State without raising much suspicion. Again, there's no evidence this has happened, but I don't like that it could happen, or even could have happened, with little or no evidence.