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A Secret Service agent scans the crowd at the amphitheater of the Arlington National Cemetery on Memorial Day May 28, 2007 in Virginia.
A Secret Service agent scans the crowd at the amphitheater of the Arlington National Cemetery on Memorial Day May 28, 2007 in Virginia.

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    How the Secret Service protects presidential candidates

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How the Secret Service protects presidential candidates

Protecting presidential candidates is business as usual for the Secret Service, but this year more passionate crowds bring new challenges to the job. CNN's Brian Todd reports.

How the Secret Service protects presidential candidates

Protecting presidential candidates is business as usual for the Secret Service, but this year more passionate crowds bring new challenges to the job. CNN's Brian Todd reports.