Mike Braun

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Mike Braun, the Republican candidate for a crucial Senate seat in Indiana, often refers to his rival, Sen. Joe Donnelly, as "Sleepin' Joe" and has vowed to wake the vulnerable Democrat from his "siesta" on Election Day.

But as Donnelly barnstorms the state in a used RV, it is Braun's own sleepy campaign that's leaving Republicans underwhelmed — and worried.