A CRJ-200 FLT CREW EXPERIENCED SMOKE IN THE CABIN AND COCKPIT ON THE GROUND. THEY EVACUATED THE AIRCRAFT.

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DURING TAXI OUT ON RAMP HEADING SBOUND; OUR FMS SCREEN PARTIALLY FAILED. I ASKED THE RAMP IF WE COULD PARK THE ACFT WHERE WE WERE AND CONTACT MAINT FOR A MINOR PROB. I CONTACTED MAINT ABOUT THE FAULTY FMS SCREEN AND WAS TOLD TO PULL 3 CIRCUIT BREAKERS BY MAINT CTL. AS SOON AS WE PULLED THE 3 CIRCUIT BREAKERS; THE FO AND MYSELF DETECTED THE SMELL OF SMOKE IN THE COCKPIT. WE DETERMINED THAT IT WAS COMING FROM THE GASPERS. AFTER CONFERRING WITH EACH OTHER THAT WE BOTH DID INDEED SMELL SMOKE; I INSTRUCTED THE FO TO PULL OUT THE EMER EVAC CHKLIST. I CONTACTED THE RAMP CTLR; TOLD HIM WE HAD SMOKE IN THE COCKPIT; WE WERE EVACING THE PAX; AND TO CALL FOR HELP. I THEN CALLED THE FLT ATTENDANT WHO ANSWERED WITH; 'WE HAVE A PROB DON'T WE?' I TOLD HER TO OPEN THE MAIN DOOR AND EVAC THE PAX BECAUSE THERE WAS SMOKE IN THE COCKPIT. THE FLT ATTENDANT AND SOME PAX SEATED NEAR HER JUMPSEAT COULD ALSO SMELL SMOKE IN THE CABIN. THE FO AND I COMPLETED THE EVAC CHKLIST AND EXITED THE AIRPLANE AFTER THE PAX WERE REMOVED. THE PAX ALL REMAINED CLOSE TO THE ACFT; FORWARD OF THE L WING. ARPT OPS; FIRE DEPT; AND MAINT WERE AT THE AIRPLANE WITHIN A FEW MINS. I USED MY CELL PHONE AND CONTACTED OUR DISPATCHER; CHIEF PLTS; MR X AND MR Y AND UNION TO INFORM THEM OF THE SITUATION. A BUS WAS BROUGHT OUT TO SHUTTLE THE PAX BACK TO THE TERMINAL WITH THEIR PERSONAL BELONGINGS. ANOTHER ACFT WAS DISPATCHED FOR OUR FLT; AND WE COMPLETED IT APPROX 2:15 LATER. MAINT DETERMINED THAT THE L PACK HAD FAILED AND BURNED UP; SENDING SMOKE INTO THE ACFT.