The political conventions of 1924 were the first conventions to be broadcast on the radio. The radio dramatically change how politicians campaigned. During the rest of that term President Coolidge did not have a Vice President (1923-1925). During Coolidge's second term his Vice President was Charles Dawes (1925-1929).
http://www.classroomhelp.com/lessons/Presidents/coolidge.html
President Coolidge was the first president to have his inauguration heard on the radio and the first president to make a radio broadcast. The first presidential political speech on the radio originated from New York City and was broadcast on 5 radio stations.
http://www.classroomhelp.com/lessons/Presidents/coolidge.html
Bill Clinton delivered the most verbiage in a State of the Union speech at 9,190 words in 1995, while he took the most time ever in his 2000 speech, which went on for one hour, 28 minutes and 49 seconds.
http://www.usnews.com/opinion/blogs/robert-schlesinger/2015/01/20/state-of-the-union-address-2015-trivia-history-firsts-and-facts
First on the radio: “Silent” Calvin Coolidge was the first president, in 1923, to have his annual speech broadcast over the medium of radio. First on television: Harry Truman in 1947 was the first president to have a State of the Union broadcast on television. First in prime time: Lyndon Johnson hit on the idea to have his 1965 speech broadcast in prime time, which would have a larger television audience, instead of the then-traditional midday time.
http://www.usnews.com/opinion/blogs/robert-schlesinger/2015/01/20/state-of-the-union-address-2015-trivia-history-firsts-and-facts
[ GALLERY: Barack Obama Cartoons ]. First on the Web: George W. Bush’s 2002 speech (remembered mostly for his reference to an “axis of evil”) was the first livecast online. Only double-dippers: Harry Truman (written) and Dwight Eisenhower (spoken) each delivered a State of the Union message in 1953.
http://www.usnews.com/opinion/blogs/robert-schlesinger/2015/01/20/state-of-the-union-address-2015-trivia-history-firsts-and-facts
It was Coolidge not Roosevelt that was the first president of the radio age. Coolidge held 520 press conferences while he was president. That was the most ever held by any president before his term. He was the last president to write almost all of his own speeches.
http://www.classroomhelp.com/lessons/Presidents/coolidge.html
30th President. Calvin Coolidge was born on July 4, 1872 in Plymouth, Vermont. Calvin Coolidge was one of two Presidents born in Vermont. He was born John Calvin Coolidge, but dropped John from his name since that was the first name of his father.
http://www.classroomhelp.com/lessons/Presidents/coolidge.html
President Coolidge's was the first inaugural ceremony to be broadcast on the radio. His 41 minute speech was broadcast by twenty-five radio stations and heard by over 22 million people. Coolidge was the last president to spend hours greeting and shaking hands of people touring the White House.
http://www.classroomhelp.com/lessons/Presidents/coolidge.html
Before that historic broadcast, radio had played a big role in Coolidge's victory in the 1924 presidential election. The night before the election, Coolidge made history when the largest radio audience ever tuned in to the broadcast of his final campaign speech.
http://www.americaslibrary.gov/jb/jazz/jb_jazz_radio_1.html
President Harding Installed a Radio in the White House February 8, 1922. February 8, 1922, was a big day at the White House. On this day President Harding had a radio installed. At the time, radio was the hottest technology there was, and the White House was on the cutting edge. Almost two years later, Calvin Coolidge, who followed Harding, was the first president to broadcast from the White House.
http://www.americaslibrary.gov/jb/jazz/jb_jazz_radio_1.html
who was the first president to broadcast a speech over the radio
Calvin Coolidge  was the first president to broadcast a speech over the radio. Calvin Coolidge was the first president to broadcast a speech over the radio.