Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both houses of Congress.
Section 2. Amendment 25 U.S. Constitution
Until that amendment was ratified in 1967, the Constitution provided a line of succession only for the nation's top job. If a Vice President died or resigned in officeor if, like Lyndon Johnson, he achieved the presidency on the death of the incumbentthe nation's No. 2 office simply remained vacant for the rest of that four-year...