Speaking with a backdrop of boardwalk rides towering around him, former President Donald Trump on Saturday evening issued both vows and warnings to New Jersey voters as he spoke to a large crowd that gathered for a campaign rally on the beach in Wildwood. Six months to Election Day, the presumptive Republican nominee predicted he will do something no presidential candidate from his party has done since 1988: carry the deep-blue Garden State, which he has lost twice by double digits. “As you can see today, we’re expanding the electoral map because we are officially going to play in the state of…