Here are a few examples:
First President to preside over a cut to the credit rating of the United States government.
First President to violate the War Powers Act.
First President to require all Americans to purchase a product from a third party.
The first President to arbitrarily declare an existing law unconstitutional and refuse to enforce it.
There are about more than two dozen other examples of Obama’s thrashing of the Constitution with links to back it all up. If you have a few minutes, please take a gander.