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It's "Super Tuesday," when voters in ten states cast their primary ballots. It could turn out to be a big day for one of the Democratic contenders, but it will certainly be a big day for electronic voting. Voters in California, Georgia, and Maryland will cast their votes with a touch-screen. After the 2000 election Congress authorized funds for states to upgrade to electronic voting, but it's still a controversial technology.

In Maryland, officials are trying to shore up confidence in the new machines. Measures include tamper-proof adhesive tape to prevent anyone from fiddling with their programming or electronics. We talk with the state's top election administrator. (Jeff Horwich guest-hosts.)