Each state has 2 senators.
Wisconsin has 8 Representative in the US House of Representatives and 2 Senators in the US Senate.
There are no senators in the U.S. Senate representing Washington DC.
No Senators for D.C.
Only states have U.S. Senators.
Washington DC has no senators.
There are 19 US Congressmen and two US Senators in the 111th Congress.
Each State has two US Senators and Washington DC being a Federal City is not a State and and is granted no representation in the US Senate.
The US Senate has 102 Senators and will continue to have the same number (2 per state plus Washington DC) until more states are admitted into the union.