Amid speculation that she might forgo a run for re-election to the Senate in 2006 in favor of a presidential run in 2008, New York Democratic Sen. Hillary Rodham Clinton has sent an early fundraising appeal that, while directed toward reelection, reads like a trial run for a White House bid. "As the Republicans' number one target in 2006, I have to begin now building resources for the tough fight I face in my re-election campaign," Clinton writes in a letter to supporters. She says her task is made more difficult by "the Republican attack machine out to distract me...