The arrests Monday in an alleged neo-Nazi assassination plot against Sen. Barack Obama involve one of a handful of serious threats against the Democratic presidential candidate, federal law enforcement sources tell ABC News.
A skinhead plot against the Democratic candidate was disrupted by authorities.
The officials say Obama has been the target of well over 500 threats, most of which are not taken seriously.
But in an estimated dozen or so cases, the threat was considered serious enough that law enforcement agents were assigned to track down suspects.
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