Which of the following groups does NOT serve in the U.S. Congress?

The correct answer is that governors do not serve in the U.S. Congress. The U.S. Congress is made up of two chambers: the Senate and the House of Representatives. Senators are elected to represent their states in the Senate, while Representatives (or Congress members) serve in the House and represent congressional districts within their states.

Governors, on the other hand, are state officials who oversee the executive branch of their respective state governments. They do not have a role in Congress, which is a federal legislative body responsible for making laws at the national level. Thus, since governors are involved at the state level and not within the legislative framework of the U.S. Congress, they do not serve in this capacity.