From "ars technica":
PA primary will be unauditable; GOP blocks e-voting reform
By Jon Stokes | Published: April 21, 2008 - 02:30PM CT
On the eve of tomorrow's hotly contested and relatively close
Democratic presidential primary in Pennsylvania, a number of voting
activists are sounding the alarm one last time about the state's
election systems. Over 85 percent of PA voters will vote on paperless
touchscreen machines that are hackable, failure-prone, and
fundamentally unauditable.
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http://arstechnica.com/news.ars/post/20080421-pa-primary-will-be-unauditable-gop-blocks-e-voting-reform.html