What is the context? Do you want to know what it means from a technical grammatical sense, as in a classroom course or legal document, or do you want to know what the author meant?
In terms of what the author meant, it could be either Steve or the governor. In terms of grammar, it's still probably somewhat uncertain.
In a real world situation, you presumably would have some other clues about what's going on. The two sentences by themselves aren't all that relevant if you don't know more about Steve, the governor, or the contract.
In either case, "Steve" makes more sense, but it's not clear to me.
In terms of technical grammar, the colon doesn't seem correct, anyway. Is that an upper case or lower case colon?
Sometimes, it's just unclear. "Lizzy told her mother that her sweater had a hole in it." Is the hole in Lizzy's sweater or in her mother's sweater?