Democrats are meddling in Republican primaries this year to an unusual degree, attempting to elevate extremist candidates who they think will be easy to defeat in midterms in the fall.

Nowhere has that strategy been more divisive than in the election for a House seat in Michigan.

Guest: Jonathan Weisman, a congressional correspondent for The New York Times.

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Background reading: 

• The meddling in Republican primaries has prompted angry finger-pointing and a debate among Democrats over the perils and wisdom of the strategy.

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