which body of government is least susceptible to public opinion polls?

The body of government least susceptible to public opinion polls is generally considered to be the U.S. Supreme Court. The Supreme Court is tasked with interpreting the Constitution and the law, and its justices are appointed for life, which allows them to make decisions based more on legal principles and constitutional interpretation than on fluctuating public opinion. In contrast, the President and members of Congress (both the Senate and the House of Representatives) are more directly accountable to the electorate and may be influenced by public sentiment as they seek re-election or to maintain public support.