Benjamin Wade who voted to remove Andrew Johnson from office and become president himself is the obvious answer to your question. At that time, the pro temp was next in line for president after the vice president.
Former pro tempore John Tyler did actually become president and pro tempore Wm King who became vice-president may have had some some presidential ambitions. Former pro tempore Lewis Cass ran for president.
The President pro tempore of the Senate is the next in line of succession after the Speaker of the House of Representatives.
Benjamin Wade
President Pro Tempore of the Senate. The office also existed in the Confederate States of America.
The Secretary of Defense (as long as they would be eligible to be elected President).
The Speaker of the House would never become President Pro Tempore, as that is an office within the Senate.
house of Representative for president president pro tempore of the senate for vice president
The President Pro Tempore of the Senate is the Vice-President of the United States. One of his jobs in the Senate is to break a possible vote tie.
The president Pro-Tempore is the presiding officer in the senate. That individual is in charge of the Senate agenda in the absence of the vice president.
The President Pro-Tempore serves in the Senate. This person presides over the Senate when the Vice-President is not in attendance.
The President Pro-tempore of the Senate.
the president pro tempore of the Senate
Benjamin Wade