Someone just spent $1.5 million on a GOP senate candidate. We'll probably never know who. - 2014-05-23
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Arkansas is witnessing what may be the most expensive political ad campaign in state history: $1.5 million worth of glowing TV spots supporting Tom Cotton, a Republican congressman who's running against Democrat Sen. Mark Pryor.
The race could decide which party controls the Senate. But no one knows who's paying for this giant ad buy—and that's partly because the group behind those ads may have flaunted IRS law in order to conceal the identities of its donors.