WASHINGTON (AP) — Hillary Rodham Clinton has a third longshot challenger for the Democratic presidential nomination.

Former Rhode Island Gov. Lincoln Chafee entered the race Wednesday.

He's a Republican who became an independent, then joined the Democratic Party two years ago.

He's made little effort to set up a competitive campaign operation, and longtime Chafee strategists and donors say they know little about his rationale for running.

Clinton also faces challenges from Vermont Sen. Bernie Sanders and former Maryland Gov. Martin O'Malley.