PLT IN A PA32 AT BED ARPT ON TKOF ROLL ROTATES OVER A KING AIR XING THE RWY MID-FIELD.

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WE WERE IN A SARATOGA ON TXWY M AT BED HOLDING SHORT FOR RWY 5 DEP. UPON BEING CLRED FOR TKOF AND A R TURNOUT BY TWR WE TOOK THE ACTIVE AND ADVANCED PWR. AS WE ACCELERATED THERE WAS A TAXIING KING AIR S OF THE RWY APPROX AT MID-FIELD. HIS SPD MADE IT APPEAR THAT HE WOULD STOP AT THE HOLD SHORT LINE. I THEN SCANNED MY AIRSPD AND NOTED WE WERE AT ROTATION SPD. AS I LOOKED FORWARD AGAIN THE KING AIR WAS ENTERING RWY 5. WE THEN ROTATED AND FLEW OVER THE TOP OF THE KING AIR. CONTRIBUTING FACTORS WERE THE FAILURE OF THE KING AIR TO STOP AND THE PLT DID NOT CHK CLR L AND R. IN ADDITION HE WAS OBVIOUSLY GOING TO A DIFFERENT RWY THAN RWY 5 WHICH COULD HAVE ADDED CONFUSION FOR THE PLT OR CTLR. CORRECTIVE ACTIONS ON OUR PART WAS TO ROTATE VERSUS TRYING TO ABORT IN THE SPACE AVAILABLE. THE TKOF/CLBOUT WAS NORMAL. ONCE AIRBORNE I ASKED TWR IF THEY SAW THE KING AIR AND THEY REPLIED THAT THEY WERE JUST LOOKING AT THAT. HUMAN FACTORS: THERE OFTEN TIMES SEEMS TO BE CONFUSION WITH THIS TWR FACILITY AND I HAVE BEEN TOLD THAT THIS IS DUE TO IT BEING A TRAINING FACILITY. FURTHER; VARIABLE WINDS WITH MULTIPLE RWYS MAY HAVE MADE THINGS MORE CONFUSING.