The Philadelphia Inquirer reports on documents from the trove released by Thomas Hofeller’s daughter:

“GOP gerrymandering got greedy the last time and bad political climate caused it to unravel,” one of the state-by-state analysis documents in the files said of Pennsylvania. “Democrats will be concentrating on trying to safe up their gains.”

That was presumably a reference to the congressional maps Republicans drew in 2001, which created more districts that were only marginally GOP friendly. Some of them were captured by Democrats in the 2006 election amid unrest over the Iraq War.