Things I’ve Recently Learned About Legislative Redistricting

His partisan rant notwithstanding, the gerrymanders he complains about are Democrat, not Republican, in origin.

Democrats have had complete control of the California legislature for two decades running (probably three+, excluding part of the one 1995-1997 term for just the Assembly).

As for New York, its current legislative boundaries' most recent partisan gerrymander was also Democrat, but the existing boundaries were drawn by a panel of Federal judges... and their product was largely praised by Democrat stakeholders:

"The plan is largely the same as that proposed by the magistrate judge, Roanne L. Mann.

Judge Mann produced her map with assistance from a redistricting expert at Columbia Law School, Nathaniel Persily. They did not take into account the residences of incumbent lawmakers, and their proposal drew praise from government watchdog groups for its compact, common-sense districts.

The lawyers who brought a lawsuit on behalf of a group of civic leaders and urged the federal courts to take over the process praised the judges’ order."[0]

[0] http://www.nytimes.com/2012/03/20/nyregion/judges-impose-new...