Sen. Clinton's former aide could be used against her By Kenneth R. Bazinet New York Daily News WASHINGTON - Hillary Clinton isn't on trial in Los Angeles on Tuesday - but as far as her political adversaries are concerned, she may as well be. Her former finance director David Rosen has been charged with concealing the real cost of a star-studded Hollywood fund-raiser for Clinton in August 2000 - and if he's convicted, her enemies plan to exploit it to the maximum. ''If it was any other senator, it might not be an issue, but with her past it will...