At his first press conference as the endorsed Republican candidate for governor, Bob Stefanowski’s derision of Democratic Gov. Ned Lamont’s leadership was tempered by pitying chuckles and one patronizing compliment: “I assume he comes in every day and tries his best.”Behind the sarcasm is a consistent theme driving Stefanowski and his second campaign for governor of Connecticut: A disdain for the business acumen and management style of the amiable businessman who bested him in 2018, and an insistence the General Electric-trained Stefanowski could do better.