He defeated Federalist candidate Arthur St. Clair , former Revolutionary War general and President of the Continental Congress , by a wide margin .
Thomas Mifflin , the incumbent President of the Supreme Executive Council of the Commonwealth of Pennsylvania was elected as the first Governor of Pennsylvania .
Thomas Mifflin defeated Federalist candidate Arthur St. Clair , former Revolutionary War general and President of the Continental Congress , by a wide margin .
Thomas Mifflin , the incumbent President of the Supreme Executive Council of the Commonwealth of Pennsylvania was elected as the first Governor of Pennsylvania .