Herr Obama At It Again

I guess Obama now thinks he can override Congress.
From Fox News:
An estimated hundreds of thousands of illegal immigrants married to  U.S. citizens will soon have an opportunity to become legal residents without having to serve a years-long punishment.
President Obama proposed the policy change in January 2012 and it is scheduled to go into effect March 4.
The change was proposed to end situations in which illegal-immigrant spouses (and often parents) have to return to their native countries to  serve the “ban of admission” – as long as 10 years for staying illegally in the United States for more than a year.....
The 10-year punishment is part of law passed by Congress in 1996 to discourage illegal immigration.
Read more: http://www.foxnews.com/politics/2013/01/30/new-obama-directive-will-shorten-visa-wait-for-illegal-aliens-with-us-spouses/?test=latestnews#ixzz2JlkgKU2r
So, now Obama can just override a law that Congress passed and another president, in this case. Bill Clinton, signed?
If this is now the standard, what can't Obama and other Presidents override or just order us little people to do?