Governor Gerry was a Democrat.  And I can find quite a few Democratic gerrymanders as well since then.  

The US Supreme Court has a case or two pending now on political as opposed to racial gerrymandering, by the way.   

"The Wisconsin case heads four legal actions on partisan gerrymanders that the Supreme Court could consider and, perhaps, consolidate. In Maryland, another three-judge panel will hear arguments over whether a Democratic legislature gerrymandered House districts in 2011 to oust a 10-term Republican congressman.
In North Carolina, a June hearing is scheduled in a suit over the unabashedly partisan carving of the state into 10 Republican and three Democratic House seats — this in a state with more registered Democrats than Republicans.
The state representative who drew that map said he had engineered 10 safely Republican seats only “because I do not believe it’s possible to draw a map with 11 Republicans and two Democrats.”