Down in the polls by double digits, former Trump UN Ambassador Nikki Haley, who recently took off the kid gloves and has been battering her Republican opponent Donald Trump, just laid the groundwork to endorse the man she calls “unstable and unhinged,” by labeling President Joe Biden “more dangerous.” “I think what’s really important is to know that the majority of Americans dislike Donald Trump and Joe Biden,” Haley told NPR’s Steve Inskeep in remarks that aired Thursday (audio below). “So we think that there needs to be an alternative.” “While critical of both men — who she called ‘too old’ …