role of the presidency

http://en.wikipedia.org/wiki/President_of_the_United_States#Article_I_legislative_role
the role of the president by definition is to pass or veto legislation.the Presentment Clause requires any bill passed by Congress to be presented to the president before it can become law. when this happens the president can either pass the bill or veto it. he can also do nothing.
http://www2.scholastic.com/browse/article.jsp?id=4683
being the president means you have certain responsibilities or roles. these roles are as the Chief of State, Chief Executive, Chief Diplomat, Commander-in-Chief, Chief Legislator, Chief of Party, and Chief Guardian of the economy.
http://usgovinfo.about.com/cs/agencies/a/presbrief.htm
the president serves as Commander in Chief of the United States' armed forces deployed around the world. he is also the head of the Executive branch of the Government and all legislation goes through him.
http://www2.smumn.edu/deptpages/~instructtech/institutional_planning/role_president.htm
the president is the sponser and initiater of stratigic planning. he provides leadership, direction and planning.The President is the chief spokesman of strategic planning.