Kennedy had always been the runoff election's front-runner in a state that overwhelmingly supported Donald Trump.
He defeated Democrat Foster Campbell, a state utility regulator whose chances were seen as such a long-shot that national Democratic organizations offered little assistance to Campbell's campaign.
Voters also were filling two open US House seats yesterday, for the 3rd District representing southwest and south central Louisiana and the 4th District covering northwest Louisiana.
The Senate runoff drew national attention, with President-elect Donald Trump and Vice President-elect Mike Pence each traveling to Louisiana to rally for Kennedy.
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The national GOP provided resources and staff into assisting Kennedy's campaign, while national Democratic organizations largely abandoned Campbell, assuming an easy win for Republicans.
Though Campbell's chance appeared slim, donations for his campaign had poured in from around the country, and several Hollywood celebrities championed his candidacy as a way to bolster resistance to the Trump presidency.
Kennedy, an Oxford-educated lawyer from south Louisiana, is in his fifth term as treasurer, a role in which he repeatedly drew headlines for financial clashes with Louisiana's governors.
He sprinkled speeches with examples of government-financed contracts he considered outrageous, like money "to study the effects of Swedish massage on bunny rabbits."
In the runoff, he ran a safe, TV-focused effort highlighting his support for Trump and his opposition to the federal health overhaul.
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