On Wednesday, Democrats will pick up a Senate seat when former astronaut Mark Kelly is sworn in as a US senator for Arizona.<br />Kelly defeated Republican Sen. Martha McSally last month.<br />Other senators-elect will have to wait until January to be sworn in for the new Congress.<br />CNN reports that Kelly is able to take the oath of office right away since he won a special election.<br />The swearing-in is slated to take place Wednesday afternoon.<br />Party control of the Senate still has yet to be determined and now hinges on two Georgia runoffs set for January.
