For how many years do we elect a U.S. Senator?

U.S. Senators serve a term of six years. This term length is established by the U.S. Constitution, specifically in Article I, Section 3. Senators may run for re-election at the end of their six-year term, and there is no limit on the number of terms they can serve. This setup was designed to provide stability and continuity within the Senate, allowing Senators to focus on long-term issues without the immediate pressure of frequent elections. The longer term also enables them to partake in discussions and policy-making processes more thoroughly than if they were elected for shorter terms.

The other options reflect the term lengths for other positions in government but do not pertain to U.S. Senators. The four-year term applies to the presidency, and the two-year term is for members of the House of Representatives, making the correct identification of six years for Senators key in understanding the structure of U.S. governance.