Assembly Speaker Sheldon Silver, long a supporter of the Second Avenue Subway and resident of the Lower East Side, is now saying the J.F.K. Rail Link is more important, according to the new Downtown Express. This is a big deal, especially because Democratic Gubernatorial Candidate Eliot Spitzer just made fairly clear this morning that he has the opposite priorities. A number of civic groups like the Regional Plan Association think the airport rail link is just too expensive, at $6 billion, to justify a the few thousand riders would take it each day to J.F.K. each day. But Silver’s pitching the rail link as a means to get Long Island residents downtown, not downtowners off to the airport.