House Editor David Wasserman writes: Beyond California, perhaps no state is poised for as big a Congressional shakeup as Arizona, where six of nine seats are in some doubt as next Tuesday's primary approaches. Part of the reason: Arizona's power struggle over a new Congressional map was one for the redistricting record books. Some bipartisan redistricting commissions, like Washington's, come to an amicable compromise when their state gains a new seat. But in Arizona, the GOP legislature took the unheard of step of impeaching health care administrator and Independent Redistricting Commission chair Colleen Coyle Mathis after she sided with Democrats to pass a dream Democratic map. When Arizona's state supreme court overruled the legislature and reinstated Mathis, Democrats scored a rare redistricting coup.

As a result, there's something for everyone in Arizona. Even though the state is gaining a seat, two Republican freshmen, Reps. Dave Schweikert and Ben Quayle, are running against each other in a member versus member race. GOP Rep. Paul Gosar is in danger of losing a primary in a seat mostly new to him, and new Democratic Rep. Ron Barber is potentially vulnerable. There's one Republican open seat thanks

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