Karl Rove vs. The Koch Brothers

Karl Rove vs. The Koch Brothers

Karl Rove's team and the Koch brothers' operatives quietly coordinated millions of dollars in political spending in 2010, but that alliance, which has flown largely under the radar, is showing signs of fraying.

And with each network planning to dwarf its 2010 effort, Republicans worry that the emerging rivalry between the two deepest-pocketed camps in the conservative movement could undercut their party's chances of taking the Senate and White House in 2012.

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