Drain the old fuel out, dump in a bunch of SeaFoam and let it sit for a day. Work some SeaFoam through the carb by giving it a few pulls... with the spark plug wire off.
After the day of soaking... drain it.
If I were you I would just as well change out the spark plug too at this time.
Now add NEW Fresh fuel/oil mix...see if it snaps out of it.
If it still drewls fuel, it will need a carb kit.
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Ed "Backwater Eddy" Carlson ~ ~ ~ ~ ><sUMo>