Ex-aide's trial puts Hil at high risk GOP salivates over campaign finance case By KENNETH R. BAZINET DAILY NEWS WASHINGTON BUREAU 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 ex-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...