florida mailman breaches no-fly zone and lands gyro-copter on us capitol west front lawn .
doug hughes , 61 , concocted the stunt to raise awareness of campaign finance reform .
flew undetected from an undisclosed location near to washington d.c and landed at 2 pm .
stunned bystanders just watched as the helicopter flew past the gen. ulysses grant statue and came to a halt .
he has been planning the stunt for two years and said he kept his wife in the dark about it .