A member of the Bush family is now officially in the race to become Maine’s next governor.

Health care entrepreneur Jonathan Bush, the cousin of former President George W. Bush and former Florida Gov. Jeb Bush, launched his gubernatorial campaign Wednesday after exploring a Republican bid since the summer. Bush had been increasing his presence in Maine political circles since the Bangor Daily News first mentioned his moves last year. His well-known cousins also hosted a fundraiser for him at the family’s Kennebunkport compound in August.

Bush, 56, was joined Wednesday by his brother, the television presenter Billy Bush, and hundreds of supporters at the Belfast office of athenahealth, the health company he cofounded in the 1990s before moving its office and hundreds of jobs t

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