Paul Manafort will serve a total of about 7 1/2 years in the prison, after being sentenced Wednesday in federal court in Washington, D.C. to an additional 3 1/2 years for conspiracy. The ruling on Manafort, President Trump's former campaign chairman who was sentenced last week in Virginia to nearly four years in prison, closes out special counsel Robert Mueller’s highest-profile prosecution to date. Moments after the second sentence was announced, Manhattan DA Cyrus Vance…