An emotional video of a groom dancing at his wedding with his wheelchair-bound mother, who suffers from ALS, is going viral on social media.At his April 9th wedding, Zac Porier shared a dance with his mother, Kathy Porier, before a crowd of 130 guests, while Zac’s brothers helped support her.She was nervous about the dance, but is glad they went through with it and is pleased that the viral video is helping to raise awareness for ALS.