LOS ANGELES - An uninvited participant swooped into Wednesday night’s vice presidential debate, and it set social media abuzz.For several minutes, a fly landed on Vice President Mike Pence’s hair, not moving as he answered questions about racial injustice and whether justice has been done in the death of Breonna Taylor.Conversation about the fly shot up on Twitter’s trending list, where debate watchers discussed their distraction and inability to focus on Pence and California Sen.