Retired Navy admiral and former Pennsylvania congressman Joe Sestak announced his candidacy Sunday on his website.
He introduced himself to voters by telling them “I wore the cloth of the nation for over 31 years in peace and war, from the Vietnam and Cold War eras to Afghanistan and Iran and the emergence of China.”
He said he postponed announcing his candidacy to care for a daughter ill with brain cancer.
Sestak was also part of former U.S. President Bill Clinton’s national security team, holds a doctorate in government from Harvard, and unsuccessfully ran for the U.S. Senate twice.
He embraces many positions popular with liberals, including abortion rights, gun control, and backs the nuclear deal with Iran.
Sestak is the 24th Democrat to officially announce a challenge to President Donald Trump in 2020, with Joe Biden, Bernie Sanders, and Elizabeth Warren leading the polls so far.