CHARLESTON -- The McCain campaign is touting a major endorsement tomorrow set for Greenville, South Carolina.
It's Sen. Tom Coburn, the Senate's resident earmark curmudgeon and staunch social conservative / doctor.
The campaign hopes the endorsement will kick-start four days of intense campaigning here with a jolt of momentum that yesterday's Michigan primary did not provide.
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Marc Ambinder is an Atlantic contributing editor. He is also a senior contributor at Defense One, a contributing editor at GQ, and a regular contributor at The Week.