With final passage in sight, advocacy groups on both sides in the tax fight are pouring millions of dollars into advertising and pressure campaigns to alternately thank or threaten swing Republicans on Capitol Hill.

American Action Network, a conservative advocacy group friendly to Speaker Paul D. Ryan, on Thursday announced a $2 million TV and digital ad campaign in 24 congressional districts across the country to thank House members who voted for the $1.4 trillion tax-cut package.

The move helps bring the group’s spending plans on pro-tax reform efforts above $24 million now.

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