30 states currently keep paper backups of all electronic voting. These places CAN be checked. More might move to a backup system in the next year as well.
Remember in Ohio, in 2004, Kerry won all the exit polls, there was a power outage for 2 hours as votes closed, and when the power came back on, Bush had a huge lead and the win. There were paper backups there too - but Bush's team sued to prevent a recount, and the republican state legisture granted it. Those votes still haven't been counted, and there is only a statistical chance of 1 in 50,000 that Bush actually got more votes in Ohio.
Exit polls have been flawless throughout history. Until e-voting came along. And people are suing to prevent elections from being stolen now. It's a good thing. We all want our vote to count.