WASHINGTON - Former Massachusetts Gov. Deval Patrick is making a late entry into the Democratic presidential race.

Patrick announced his bid Thursday in an online video, saying, "I am today announcing my candidacy for president of the United States."

Patrick made history as the first black governor of Massachusetts and has close ties to former President Barack Obama and his network of political advisers. But he faces significant fundraising and organizational hurdles less than three months before voting begins.

Patrick's announcement comes as some Democrats worry about the strength of the party's current field of contenders. Another Democrat - former New York City Mayor Michael Bloomberg - is also weighing a last-minute bid for the party's nomination.

Bloomberg has taken steps toward launching a last-minute presidential campaign, filing candidate papers in Alabama and Arkansas. Even 2016 nominee Hillary Clinton this week said in a BBC interview that she is "under enormous pressure from many, many, many people to think about it," adding that she has no such plans but still would "never, never, never say never."

The moves reflect uncertainty about the direction of the Democratic contest with no commanding front-runner. Joe Biden entered the race as the presumptive favorite and maintains significant support from white moderates and black voters, whose backing is critical in a Democratic primary. But he's facing spirited challenges from Patrick's home-state senator, Elizabeth Warren, and Vermont Sen. Bernie Sanders, progressives whose calls for fundamental economic change have alarmed moderates and wealthy donors.

Patrick could present himself as a potential bridge across the moderate, liberal and progressive factions - as candidates like Mayor Pete Buttigieg, Sen. Kamala Harris and Sen. Cory Booker are trying to do.