Obama is not abusing his powers, he is usurping powers which he is not authorized to use.
However, as long as America does nothing, Obama will continue to usurp powers and abuse them at will.
There is no mechanism save Impeachment to prevent a President from becoming a dictator
Congress refuses to act, and as a result we are currently have a dictator
Two way street though, the marxists are yukking it up now, but wont be laughing when the right takes control and the purges start