The Supreme Court on Monday agreed to hear a Republican-led challenge to campaign finance limits on coordinated spending between candidates and political parties, potentially blowing up the money-in-politics landscape ahead of the 2026 midterms.

A ruling in favor of the Republican plaintiffs would deliver the GOP’s biggest campaign-finance win since the landmark 2010 Citizens United case, fundamentally changing how party committees spend tens of millions of dollars every election cycle, particularly on TV advertising. A GOP victory could allow party groups to pour unlimited amounts into ads in competitive races across the country, making it…

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