Stephen Colbert said he understands why Rosie O'Donnell and Ellen DeGeneres left the United States. He’s considering doing the same after being fired.In a candid and emotional interview this week, late-night television icon Stephen Colbert revealed that he is seriously considering leaving the United States after his abrupt firing from CBS. Colbert, whose razor-sharp wit and political satire have defined “The Late Show with Stephen Colbert” for nearly a decade, told reporters, “Now I understand w