Once again, Nelson Mandela is breaking down barriers. This time it is American political barriers for the upcoming Mandela: The Long Walk To Freedom. The Weinstein Company said today that former Secretaries of State Hillary Clinton and Colin Powell as well as 2008 GOP Presidential nominee Sen. John McCain will co-host a special screening of the Justin Chadwick-directed film at the Kennedy Center. It will take place in DC on November 20 with Weinstein Co co-chairman Harvey Weinstein, Chadwick and co-star Naomie Harris set to attend. This latest Mandela screening in DC comes the same day college students will be able to see the film for free in Georgetown as part of an 8-city tour the Weinsteins and Coke-Cola are offering across the country. It also comes just over two weeks after a special screening of the film was held at the White House with star Idris Elba among those in attendance with President Obama and longtime supporter Weinstein. “We truly hope that members of Congress from both sides of the aisle come out to see the film in honor of a man that both political parties in this country worked to free, and who set a global standard of putting politics aside and working with former adversaries to achieve justice and equality,” Weinstein said Friday in announcing the bipartisan screening.The November 20 even also is Clinton’s latest Hollywood encounter in the road to a widely assumed Presidential run in 2016. The former First Lady was here last week for some face time at a PGA/Clinton Foundation event, and she also received an award at the International Medical Corps gala at the Beverly Wilshire. The big-ticket event for 800 guests included big Democratic bundler and DWA CEO Jeffery Katzenberg among its co-hosts and Viacom boss Sumner Redstone among the attendees.