Democratic Sen. Patrick Leahy of Vermont was sworn in Tuesday as president pro tempore of the Senate. As the longest serving Democrat now in the Senate, Leahy moved to third place in the line of presidential succession, behind Vice President Joe Biden and House Speaker John Boehner. Biden swore Leahy in as the successor to Hawaii Sen. Daniel Inouye in the Senate post. Inouye, who also chaired the Senate Appropriations Committee, died Monday at age 88. A vase of white roses was on Inouye’s desk on the Senate floor.