Which role of a senator takes place only at the capitol?

I believe the answer is: serving on a committee

Within the committee,senators from each state have to form relationships with other senators that might have opposing view.

After that, they would debate their view in the chamber and eventually vote for the type of legislation that give the most positive benefit for the country.

the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj