Nassau Republicans have picked Missy Miller, an Atlantic Beach mother who gained notoriety advocating to legalize medical marijuana to help her son, who has a severe form of epilepsy, to run in the 20th Assembly District, GOP officials said Tuesday.

Miller, 52, is a first-time candidate and disability rights advocate, most recently lobbying for the Compassionate Care Act, a 2014 law which legalized medical marijuana for about 10 diseases and syndromes.

“I’ve been doing some form of advocating for 25 years,” said Miller. “This will give me an opportunity to make change from the other side of the table.”

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Miller’s son, Oliver, 16, has a brainstem injury and uses a wheelchair. She was recently able to obtain medical marijuana for Oliver and said the pot helped stem his seizures.

The seat was vacated in April after Democrat Todd Kaminsky won an election to the State Senate. Democratic Assembly candidates include Long Beach City Councilman Anthony Eramo and former Nassau Legis. Jeff Toback. Long Beach firefighter Sam Pinto is also mulling a run.