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Arizona -- Thanks for sharing this. I'll add my own comments.
Redistricting (gerrymandering) in 2011 followed the 2010 census, so we cannot blame the poor Democratic Party election results in the 2010 elections on redistricting. Rather the Republicans just outsmarted the Democrats by pouring money into selected state races that turned the balance of power in those legislatures over to Republicans. And then the Republican controlled state legislatures did the redistricting...at least as the law allowed. Arizona had their own rules which as you have pointed out are being challenged.
Redistricting, of course, affects the House districts but the Senate races are statewide, (except for Maine and Nebraska) and are not affected by redistricting. I've spent a lot of time analyzing voter turnout, and yes we can blame redistricting in part for losses in 2014, but in 2012 when Obama was being reelected we actually regained House and Senate seats lost in 2010.
The big reason Democrats lost big in 2010 and 2014 is that they stay home when there is no president to elect in those years. They just can't seem to get excited to get off their behinds and vote. As one who has registered voters in Colorado and canvassed for candidates door to door to get out the vote my biggest frustration with my fellow Dems is apathy. We can complain about gerrymandered districts, we can complain about restrictive voter ID laws and limited polling places, and yes they make a difference, but the magnitude of that difference is small by comparison to the huge number of people who just didn't care to vote in those years (2010, 2014).
Colorado did better than most states in 2014 with all mail-in ballots and ballot drop-off locations. But even then many Dems didn't feel like opening the ballot or putting a stamp on it and mailing it. There is another factor...those Democratic candidates that ran away from the Obama agenda (Obamacare especially), lost their elections. I guess they just felt intimidated by the Republican attack ads on Obama. In my state of Colorado, Senator Udall with an impecable record as senator lost because he ran a shitty campaign...running some ads on why he opposed Obama. On the other hand, Governor Hickenlooper stuck to his guns and defended his record and agenda...and he won.
We will have to wait until the 2020 census to reverse the gerrymandered districts from 2010, but that will only happen if Dems get passionate and vote. All we have is excuses. In the meantime, we can make large inroads in 2016 and at least take back the Senate. But hey in 2018 we will lose it again just like we always do...because we don't care enough to VOTE.