Can't blame him for lack of subdivision of the Jewish vote given that we're only 2% of the population all lumped together, but it would be really interesting to see the secular/Reform/Conservative/Orthodox breakdown. I'd guess around 75% D secular, 70% D Reform, 60% D Conservative, and 30% D Orthodox (probably breaking down into around 50% D for Modern Orthodox and 20% D for Haredi). Sephardic Judaism mostly exists outside of that structure, and if you also separate out Jews who identify as Sephardic I'd guess around 55% D.
Aren't most Sephardim fairly conservative recent immigrants, or am I mistaken?
As an aside, there's an extremely old
Sephardic community in Charleston which was until the early 1800s the largest Jewish community in the country. I had a teacher in Middle School who was actually a descendant of one of the founders of the first synagogue there.