BE23 PLT INADVERTENTLY FLIES INTO IMC WHILE OPERATING VFR IN 42I AIRSPACE.

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INADVERTENT VFR FLT INTO IMC (LOW CLOUDS/FOG) OCCURRED 5- 10 MI W OF ZAINESVILLE; OH. CAUSE OF THE INCIDENT WAS POOR JUDGEMENT ON MY PART; IN TRYING TO PUSH ON INTO DETERIORATING CONDITIONS BEFORE LNDG TO IMPROVE THE LIKELIHOOD THAT THE FRONT WOULD BE PAST US BY MORNING. I WAS FLYING AT 600-800 FT AGL BENEATH CEILINGS OF 1000- 1500 FT AGL WHEN ENTERING THE CLOUD. I SUPPRESSED A NEARLY IRRESISTIBLE DESIRE TO FLY LOWER AND GET UNDERNEATH (CLRLY WRONG -- FOR ALL I KNEW THIS WASN'T A CLOUD; BUT FOG EXTENDING TO THE GND); EXECUTED A STANDARD RATE TURN FOR 1 MIN; NOTED THAT MY HDG WAS 180 DEGS OPPOSITE THE PREVIOUS HDG; AND EXERCISED PATIENCE WHILE 2 OR 3 UNENDING MINS WENT BY BEFORE RETURNING TO MARGINAL VMC CONDITIONS. LANDED AT 42I SAFELY; CONCLUDING THE FLT. CONTRIBUTING FACTORS INCLUDE: 1) A DESIRE TO GET HOME THE FOLLOWING DAY (GET THEREITIS). 2) DARKENING SKY; MAKING OVERALL VISIBILITY WORSE; 3) FATIGUE; FROM HAVING FLOWN ALL DAY. 4) PREVIOUS EXPERIENCE FLYING IN MARGINAL CONDITIONS WITH NO TROUBLE RESULTING IN AN INAPPROPRIATE LEVEL OF OPTIMISM GIVEN THE SIT. TRAINING ON HOW TO HANDLE FLYING INTO CLOUDS SHOULD EMPHASIZE THAT THIS WILL LIKELY HAPPEN NEAR THE GND -- A SCENARIO I HAD NEVER CONSIDERED. THE DESIRE TO DSND BELOW THE CLOUD WAS ALMOST OVERWHELMING. WITHOUT THE HOOD TRAINING IT WOULD LIKELY HAVE BEEN IRRESISTIBLE.