Funny how none of the Republicans here were whining about biased commissions when Christie essentially forced a Republican tie-breaker upon NJ's redistrictong commission by threatening to withdraw the original independent tie-breaker's research grant if he didn't resign from the commission.
Even if the "Mathiasmander" conspiracy-theory is somehow true, who cares? Republicans won most of the redistricting wars and should be thanking their lucky stars that independent redistrictong commissions exist because otherwise the Democrats would've obliterated them in California. You guys lost in Illinois and Arizona (and arguably CT) and got better maps that either leaned Republican or were better than you should've gotten in CA, CO, WA, WI, NE, KS, MO, MI, OH, TN, AR, TX, AL, FL, GA, SC, NC, VA, MD, WV, NJ, PA, NY, and arguably LA, MN, and IN.
TL; DR: Republicans can cry me a river regarding Arizona, whether Mathias was a Democrat or not. They won or got a better result than they would with truly non-partisan redistricting almost everywhere else along with wasted opportunties by Democrats in AR, WV, and MD.