COLUMBUS, Ohio—Two-term Cincinnati Mayor John Cranley joined the race for Ohio governor on Tuesday, pledging to modernize Ohio’s infrastructure and economy with proceeds from legalizing marijuana and to extract money from energy companies for homeowner rebates that will help lift family budgets. With the launch of his campaign Tuesday, Cranley joins his friend, Dayton Mayor Nan Whaley, in the Democratic field. She announced her bid April 19. Republican Gov. Mike DeWine is expected to run for a second term, a campaign that will begin with a contested primary. Cranley, 47, had been exploring a bid for the Democratic nomination for months and had raised more than $1.3 million for the effort as of July. Whaley reported raising more than $1.6 million. First elected mayor in 2013, Cranley is term-limited from running again this year. He points to his record as chief executive of a major city that’s growing while others …