New Jersey became the seventh state in the country where Democrats now control the legislative and executive branches with the election on Tuesday of Philip D. Murphy, a former Wall Street banker with no experience in office, as its 56th governor, according to The Associated Press. The decisive victory by Mr. Murphy, who transformed himself from a Goldman Sachs executive into a progressive Democrat to match the direction of an anxious political party, gives Democrats a badly needed lift and a governor who has vowed to make his state a bulwark against the policies of President Trump.