The campaign to convince Missouri voters to legalize sports betting received a massive infusion of cash Friday.

The parent company of Boston-based DraftKings, one of the nation’s largest sports wagering companies, wrote a $3.5 million check to the political action committee supporting the ballot initiative, according a filing with the Missouri Ethics Commission.

With the latest cash infusion, the PAC, known as Winning for Missouri Education, has topped the $10 million mark in money raised in the effort.

The contribution from DK Crown Holdings came three days after the Missouri Secretary of State verified the campaign had collected enough valid signatures to put the question on the November ballot.

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