Raw gas leaked down into the bottom end of your bike!!
First step turn off the gas valve, remove the spark plug (which is probably total soaked with gasoline) and start kicking the bike over. This will help remove some of that fuel from the engine... Some guys will suggest that you turn the bike upside down to pump out the raw fuel.. and you may need to do this...
Most likely you will need a new spark plug. Once you get the gas dried up, your bike should start right up.
Let me know how you make out!
