It’s possible he’s just looking for attention, but it’s also possible he’s starting to believe his own press:
Former Vice President Joe Biden is tiptoeing toward a potential run in 2020, even broaching the possibility during a recent gathering of longtime foreign policy aides.
Huddled in his newly opened office steps from the U.S. Capitol, Biden began a planning meeting for his new diplomacy center by addressing the elephant in the room. He said he was keeping his 2020 options open, considering it a real possibility. He insisted he had made no decision, and didn’t need to yet, according to five people who either attended the meeting or were briefed on it by those who did.
One the one hand, this is a bad idea — a lot of more attractive candidates figure to run. On the other hand, history strongly suggests that this is a problem that will take care of itself quickly.