A day after an East Hampton Democratic primary, voters could be forgiven for wondering what all the fuss was about. Candidates from what might be considered the old-line part of the party won with ease. In what appeared to be a very strong turnout for a down-ballot primary, the East Hampton Reform Democrats’ trustee challengers were defeated. The strength of an activated Democratic base could also be seen in Andrew Strong’s win over East Hampton Town Justice Lisa R. Rana, a Republican who had sought cross-endorsement.