WASHINGTON — About 2 in 3 Americans say they favor term limits or a mandatory retirement age for Supreme Court justices, according to a new poll that finds a sharp increase in the percentage of Americans saying they have “hardly any” confidence in the court.The poll from The Associated Press-NORC Center for Public Affairs Research finds 67% of Americans support a proposal to set a specific number of years that justices serve instead of life terms, including 82% of Democrats and 57% of Republicans. Views …