STICK SHAKER ACTIVATED ON AN APCHING CRJ200 WHEN THE FO FAILS TO MONITOR AIRSPD WITH THE SPOILERS DEPLOYED ON A HIGH APCH TO TUS; AZ.

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MY FO WAS FLYING; CLRED FOR A VISUAL TO RWY 29R AT TUCSON. WE WERE HIGH. I WAS CHANGING FREQ TO TALK TO TWR AND COMPLETING THE BEFORE LNDG CHKLIST. AT APPROX 2000 FT AGL; STICK SHAKER OCCURRED WHICH SURPRISED BOTH OF US. BY THAT TIME; 2ND STICK SHAKER OCCURRED. I TOOK CTLS; ADDED PWR; LOOKED AROUND COCKPIT MOMENTARILY AND NOTICED FLT SPOILERS WERE EXTENDED. RETRACTED SPOILERS AND FLEW A NORMAL LNDG AND APCH. NO INJURIES AND NO DAMAGE. AFTER LNDG; I TALKED TO FO AND SUGGESTED WHEN SPOILERS WERE DEPLOYED; HE NEVER TAKES HIS HAND OFF THE LEVER UNTIL THEY ARE FULLY RETRACTED. IN THIS ACFT; IT IS VERY EASY TO FORGET ABOUT THE SPOILERS BEING EXTENDED AS ALMOST EVERY CRJ200 PLT CAN ATTEST TO AT ONE TIME OR ANOTHER; MYSELF INCLUDED. NOW; WHENEVER I HAVE A NEW FO TO FLY WITH; MY BRIEF WILL INCLUDE A REQUIREMENT TO KEEP A HAND ON THE SPOILERS AT ALL TIMES WHEN EXTENDED. SUPPLEMENTAL INFO FROM ACN 620160: AS WE WERE BEING VECTORED TO THE FINAL APCH COURSE; WE WERE HIGH AND APCH SAID WE COULD 'S-TURN' ALONG FINAL TO LOSE ALT. I SLOWED ENOUGH TO GET GEAR DOWN AND FULL FLAPS. SPOILERS WERE DEPLOYED TO AID IN THE HIGHER THAN NORMAL DSCNT RATE. AS AIRSPD BLED OFF AND WE WEREN'T AT A STEEP ENOUGH DSCNT TO INCREASE OR MAINTAIN AIRSPD; SO WE GOT THE STICK SHAKER ACTIVATED AND AUTOPLT DISCONNECTED. I TOOK THE CTLS AND STARTED THE NOSE SLOWLY OVER AND THE STICK SHAKER WENT OFF AGAIN. THE CAPT TOOK THE CTLS AND ADVANCED THRUST; STOWED THE FLT SPOILERS AND THE ACFT IMMEDIATELY WAS UNDER CTL. CONTRIBUTING FACTOR WERE HIGH WORKLOAD TIME -- LOSS OF SITUATIONAL AWARENESS OF AIRSPD.