Marco Rubio isn't the only primary spoiler to have generated some momentum in the GOP this year: CongressDaily's Erin McPike, writing at Hotline OnCall, points to a smattering of straw-poll losses for establishment-backed Senate candidates in Republican primaries.

The straw-poll strugglers include Sue Lowden in Nevada, Jane Norton in Colorado, Dan Coats in Indiana, and Carly Fiorina in California.

Straw polls don't play a huge role in determining who will win an election, and they're mostly reflective of the constituency segment that organizes them.

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