From a Lexis press release:
The LexisNexis ASPIRE (Associates Serving Public Interests Research) program allows qualified graduates to access a specified menu of LexisNexis services during the deferral period. To be eligible for LexisNexis access via this program, you must have accepted an Associate position at a law firm, but 1) are experiencing a deferred fall 2009 start date, and 2) be taking on public interest work during your deferral period.
Register at the link above. Once your eligibility is confirmed and you begin your public interest position, Lexis will permit you to use your student ID to access a specific menu of the resources available on Lexis.