LYNDHURST, N.J. — Former Vice President Joe Biden blessed the campaign of New Jersey gubernatorial candidate Phil Murphy on Sunday, describing the upcoming election to succeed outgoing Gov. Chris Christie as the “single most important” of the next three years — even eclipsing the 2018 midterms.In what was largely a repudiation of President Donald Trump, Biden said Democrats haven’t done enough to acknowledge the problems faced by many in middle-class America and said he viewed Murphy — a former Goldman Sachs executive who served as U.S.