Sen. Daniel Inouye (D-HI) "becomes the third-longest-serving senator in U.S. history on Thursday, a landmark for the powerful lawmaker who has held a seat in Congress for as long as Hawaii has been a state," the AP reports.
Inouye has been in office in the U.S. Senate for nearly 47 years.
Roll Call notes Inouye today also set a second milestone: he became the fifth-longest-serving member of Congress in history.