GSE lobbyists on Capitol Hill are getting a jump on the debate over a proposed bill to restructure oversight of Fannie Mae and Freddie Mac by circulating a memo that argues against a key provision in the legislation. Sen. Chuck Hagel, R-NE, introduced the Federal Housing Regulatory Reform Act of 2005 in January, which called for the creation of a tough new regulator for the GSEs. The bill would grant this agency certain powers that…