Conceivably, you have hydrostatic lock . . . if you have a MANUAL (vs. a vacuum-actuated) petcock, and left the lever in the ON position overnight, and if your carburetor float valve isn't sealing fully, fuel could flow on the floor, as you mention, and maybe into the engine. If the fuel flowed into the engine, past the intake valves, the liquid could accumulate in the cylinder. Since liquid is virtually incompressible, you could experience hydrostatic lock.
Cure: remove spark plug and purge fuel from cylinder; drain and replace engine oil if contaminated.
On the othe rhand . . . if all you get is a "click" when you push the starter button, you may have only a weak battery, or bad electrical connection.
Hoping it's case # 2!
(I'd jump it with a known hot battery, before I cried, "Hydrostatic locke!" in earnest. If you have a stock, vacuum-actuated petcock, most unlikely you have hydrostatic lock.)