NEWARK — Two days after writing a second $300,000 check to a Democratic super PAC, a donation earmarked to help Sen. Bob Menendez’s 2012 reelection campaign, Florida eye doctor Salomon Melgen sent an email to one of the group's top fundraisers bringing up his $8.9 million Medicare dispute in which he was allegedly trying to get officials to intervene.“Jake, please find attached memo on the latest developments,” Melgen wrote, attaching a lengthy memo from a law firm he had hired to work on the billing dispute.