The lieutenant governor and the top elections official, both Republicans, are investigating whether the challenger coordinated with a Democrat to confuse voters.
Republicans argue that the Senate campaign by Dan J. Sullivan, right, was planned by Democrats to confuse voters and hurt Senator Dan S. Sullivan, left, a second-term lawmaker.
Many Democrats are sticking by their presumptive Senate nominee Graham Platner. But some have soured, and others are anxious about how recent revelations could affect a close race.
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