Trump's primary interventions

Another South Carolina race proved the president's power: GOP incumbent Rep. Mark Sanford lost his primary last week after President Trump encouraged voters to ditch him because he wasn't loyal to him.

• Yesterday, Trump continued his attacks on one of his own, telling Republican members of Congress that Sanford is a "nasty guy," according to Washington Post.

Why it matters: Sanford isn't the first Republican incumbent to lose his bid for re-election after the president weighed in, and he won't be the last. President Trump might be getting what he wants, but he could hurt the party's chances at keeping the House come November.

Be smart, from Sanford's interview with WaPo: “The tragedy of the Trump presidency is that he thinks it’s about him."

Go deeper:

• Both parties are spending record amounts on House campaign ads
• Dems poll better in swing districts when they discuss gun violence
• Trump’s new challenge: owning the consequences of Trumpism