A pair of Republican and Democratic political insiders agreed Tuesday night that Gov. Sarah Huckabee Sanders’ latest dig at Vice President Kamala Harris — in which Sanders echoed Sen J.D. Vance’s “childless cat lady” attacks — was “unnecessary.” Despite intense backlash to Vance’s criticism of “childless cat ladies,” Sanders told attendees of Donald Trump’s town hall in Flint, Michigan, on Tuesday, “My kids keep me humble.” “Unfortunately, Kamala Harris doesn’t have anything keeping her humble,” said Sanders, an apparent jab that Harris does not have biological children. Want more breaking pol…