Alaska GOP Sen. Dan S. Sullivan can’t shake his same-name challenger.

Retired teacher Dan J. Sullivan punched a ticket out of the state’s top-four, all-party primary early Wednesday morning. He could now play spoiler in a high-stakes Senate clash between the Republican senator and former Democratic Rep. Mary Peltola that could help swing control of the upper chamber.

Republicans fought and failed to keep Dan J. Sullivan off the primary ballot, arguing he was a Democratic plant designed to boost Peltola. Both Dan J. Sullivan and Peltola’s campaign have denied any coordination.

The senator’s allies have already taken steps to mitigate the second Sullivan’s potential vote siphoning, in some cases running ads using the senator’s middle initial to help differentiate between the same-named candidates.

Supporters of the state’s ranked-choice voting system, which kicks in for the general election, argue the process helps curtail the spoiler effect. But the presence of other candidates could still skew the results of the battleground race. Outside groups flooded the primary with more than $2 million to boost myriad fringe candidates — and could do so again ahead of November.

It’s not smooth sailing for Peltola, either, as she wages an uphill battle to flip a red seat in a state President Donald Trump won by 13 percentage points in 2024. She recently replaced her campaign manager in a staffing shakeup ahead of the primary, among other internal moves.

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