NEW YORK (AP) ? Vice President Joe Biden is continuing his coy approach to a possible 2020 presidential bid. The Democrat told Stephen Colbert on CBS' "Late Show" Tuesday, "I don't plan on running again, but to say you know what's going to happen in four years is just not rational." He added, "I can't see the circumstance in which I'd run, but what I've learned a long, long time ago, Stephen, is to never say never." Biden told Colbert his decision not to run in 2016 was right for his family, even though he was "best prepared at this moment to lead the country."