[1] At the end of his congressional career, Brantley also served as a delegate to the 1912 Democratic National Convention, which convened in Baltimore's Fifth Regiment Armory.

It was one of the most important political presidential nominating conventions in Democratic Party and American history.

After a major battle through numerous ballots for the presidential nomination pitting James Beauchamp ("Champ") Clark of Missouri, the powerful Speaker of the House, against Woodrow Wilson, the progressive Governor of New Jersey, Governor Wilson won the party's nomination and later went on to win the presidency.

After his time on Capitol Hill ended, Brantley remained afterwards in Washington for another two decades to continue to practice law there.

He died in that city in 1934, and was returned home to Georgia to be buried in Blackshear Cemetery in the town of his birth.