Simply attempting to accomplish the goal stated in the title suggests that the researchers in question were hoping for a bit of free press. But given how important the transactions carried out by e-voting kiosks are, I hope they get a lot of it. According to this article from the San Francisco Chronicle, "state-sanctioned teams of computer hackers were able to break through the security of virtually every model of California's voting machines and change results or take control of some of the systems' electronic functions."
Now to be fair, the researchers were given the source code to the devices, as well as instruction manuals and physical access to the hardware itself, which isn't too likely to happen out in the real world. But given that two of the three items in question are a mere Internet leak away, it's reasonable to be a little bit worried about deploying these devices to hundreds of polling locations with minimal physical security come November.
Tags: electronic voting, kiosks