Both parties gerrymander, but urban residents, who tend to prefer Democrats, are much easier to “pack and crack,” as they say. The result is that, of the on average 60 seats that get flipped every election on account of gerrymandering, two thirds flip for Republicans.

That’s a twenty seat advantage that Republicans get for gerrymandering. There’s no “hysteria mongering” about Democratic gerrymandering because, at the end of the day, it’s not the Democrats who can rule with minority support.