President Barack Obama is venturing onto the hallowed ground of the World Trade Center site, getting a firsthand look at the skyscraper being built to replace the twin towers destroyed in the Sept. 11 terror attacks. (June 14) Subscribe to the Associated Press: http://bit.ly/APYouTube Download AP Mobile: http://www.ap.org/mobile/ Associated Press on Facebook: http://apne.ws/c7lQTV Associated Press on Twitter: http://apne.ws/bTquhb Associated Press on Google+: http://bit.ly/zuTKBL source