Bob Casey
There are 100 Senators in the US Senate. Two of them are John McCain and Rand Paul
Senators.
Tim Johnson and John Thune are the names of the US Senators from South Dakota.
McCain and Kyl.
As of September 2021, one of Michigan's U.S. senators is Debbie Stabenow, a Democrat, serving since 2001.
This question cannot be answered without having a particular state. You may find an answer using the state name in the question. The related link below links to a list of all sitting US senators. You can see a current list at the related links below (Wikipedia, Senate.gov).
US Senators serve six year terms. There is no limit on how many terms they can serve. It is common for senators to serve for multiple terms.
If you meant US senators there are one hundred. There are two senators for each state and fifty states in the union. Multiplying 50 by 2 gives the answer 100 for the number of senators in the US.
James Webb
Harry Reid
McConnell and Bunning.