Hillary Clinton was on the verge of tears when she met a man caring for his 84-year-old mother with Alzheimer's disease backstage at a campaign event in Manchester, New Hampshire.

Clinton's campaign posted a video of the man, who only has a part-time job, telling the Democratic presidential candidate he cannot afford to pay for adult daycare for his mother, so he takes her to work with him. Clinton fights back tears as she turns away from the man and says, "oh my gosh" -- prompting the man to apologize and say he didn't mean to upset her.

"No, no I'm so glad you did, oh my gosh, thank you, thank you," the former Secretary of State said, her voice cracking. "Your story is so incredibly moving and it's also a story for so many people, that's why I keep fighting."

Clinton has released a plan seeking to cure Alzheimer's by 2025 and called for $2 billion per year to be dedicated to research into the most common cause of dementia. Clinton has also said she will push for expanded Medicare coverage for Alzheimer patients, which would provide some relief for families that have to care for loved ones with the disease.

"Families are trying, like you are, to do the best they can, but they've got to have more support, and they've got to have more quality respite care, day care that is affordable where they feel ok," she told the man in New Hampshire. "But I would also like to see you get more support through your employment."

Clinton, who trails Sen. Bernie Sanders (I-Vt.) in polls ahead of Tuesday's New Hampshire primary, also got choked up ahead of the Granite State's primary in 2008, before going on to win the state's primary.

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