The Governor of that state
The President can never appoint someone to fill a Senate vacancy. The U.S. Constitution allows the Governor of the state to which the vacant seat is entitled to make a temporary appointment to fill the seat until a special election can be held, but only if the state legislature has passed a bill allowing him/her to do so. Actually there is one Senate vacancy for which the President appoints a replacement: the U.S. Vice President, who constitutionally is also the President of the Senate. Vice presidential appointments require the approval of both houses of Congress.
A "vacancy" on the Supreme Court means one or more of the nine US Supreme Court justices has left office permanently (usually through death, retirement or resignation), and the President needs to nominate a new person or people, with the advice and consent of the Senate, to fill the vacant seat(s).
There is a section in the U.S. Constitution that grants the chief executive power to select a Supreme Court Justice when a vacancy occurs. This is an example of the checks and balances system created in a democratic form of government.
filling a vacancy in the presidency
The Senate Employment Bulletin is published as a service to Senate offices choosing to advertise staff vacancies.
Filled and sworn in was Roland Burris.
The Governor appoints someone to fill the vacancy.
The 17th amendment of the U.S. Constitution specifies that when a vacancy occurs in the U.S. Senate, the Governer of that state shall appoint a temporary Senator to fill the vacancy pending the next election.
The US Senate had 100 voting members, 2 from each state. Once in a while a vacancy occurs and the Senate may be short some of its members for a little while.
The 17th Amendment to the US Constitution requires that vacancies in the senate be filled by special election. In most states, the state governor can appoint an interim senator to fill a vacancy in the state's senate seat until a special election is held. However, in Oregon and Wisconsin the seat remains vacant until a replacement is elected.
When a vacancy occurs in the office of the lieutenant governor of Texas, the Senate will elect one of its members as the acting President of the Senate until the next state-wide office election.
mr deeds goes to town
The Governor of that state
State Senator
As of this answer, Elena Kagan was approved in a 13-6 vote by the Senate Judiciary Committee. The next step is a full vote in the Senate.
The word "vacancy" is a noun.