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May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.May 2015 - Burlington, Vermont -- Bernie Sanders formally announces his candidacy for U.S. President.