I'll begin on a relatively optimistic note. Should you fight on to preserve your presidency and succeed in staving off the calls for impeachment, you face the prospect of constant ridicule at home, diminished respect and power abroad, and an utter lack of moral authority. You have brought shame upon your family for a thousand generations. Despite of all this, by refusing to resign you will avoid a glaring footnote in history textbooks as a President who in disgrace. Instead you will simply be the President who rechristened the Oval Office as 'The Oral Orifice.
Fighting is certainly preferable to the disgrace of resignation.
Unfortunately, the cries for impeachment are growing louder. Democrats are fleeing your side like rats from a sinking, Gored ship. Republicans are licking their chops. And Ross Perot is said to be preparing a whole slew of charts. You're running out of options, Mr. President.