Your information is correct & FYI my tree is public, My father is a Reilly, his grandmother is Emma Porter. He remembered that his grandmothers father was a legislator. I did a google search for Porter PA legislator and found the picture of David. I just wrote my sisters for some objectivity and my sister agrees there is a striking resemblance to David R. Porter. Although I have not yet found a paper trail, I wonder if David's granddaughter is my father's grandmother. Also, I have not checked the source of the photo I am referencing, so there are multiple possibilities of error.
I do not live in the same town as my father so there will be a delay. I will have him get a ydna test by summer and write back then!