Harding was the first to talk on radio.
No - not by about 40 years. Coolidge made a radio speech in 1923.
Calvin Coolidge
Warren Harding was the first to speak on the radio. The date was flag day, June 14,1922 and it was not a formal speech. On December 6, 1923, President Coolidge was the first president to have his state of the union address heard on the radio.
the first president who spoke on radio was wilson.
On Saturday....
On Saturday....
Warren G. Harding He was the first President to speak on the radio and the first to have a radio in the White House.
On December 6,1923 , President Calvin Coolidge had his state of the union address to Congress broadcast live across the nation. That was the first live radio speech. Coolidge later made several radio campaign speeches.Earlier, on June 14,1922, a speech of President Warren Harding which had been recorded on a disk, was broadcast on commercial radio. Woodrow Wilsonin 1919 made some remarks from shore to sailors on some US navy ships at sea via a military radio- the first time a President spoke on the radio.
That was Calvin Coolidge. His inauguration speech in 1925 was the first to be broadcast nationwide via radio.
If you are quoting directly from President Obama's speech (from a transcription of it, or from the speech as you saw Mr. Obama himself deliver it on radio or TV), it is a primary source. If you are quoting from other people -- reporters or political scientists or columnists who are talking about the speech or giving their opinions of what Mr. Obama said, those are secondary sources.
Nixon