Senator Rand Paul (R-KY) announced on April 7, 2015 that he was running for President. His tweet, sent out shortly after 12:00 pm CST, was followed later the same day with a speech at Galt House Hotel in Louisville, Kentucky in which he outlined his motivation for a run:
“To rescue a great country now adrift, join me as together we seek a new vision for America. Today I announce with God’s help, with the help of liberty lovers everywhere, that I am putting myself forward as a candidate for president of the United States of America.”
In announcing his intention to seek the presidency, Paul joins Senator Ted Cruz (R-TX) as the only declared Republican candidates.
— Dr. Rand Paul (@RandPaul) April 7, 2015
Full text of the speech here.