An attendee adjusts a mask depicting Hillary Clinton, 2016 Democratic presidential nominee, while holding an effigy of Donald Trump, 2016 Republican presidential candidate, ahead of a Clinton campaign event in Tempe, Arizona, U.S., on Wednesday, Nov. 2, 2016. Clinton added a stop in Michigan and her campaign is pouring more money into advertising there and three other states once considered safe amid concerns among some Democrats that a new FBI review of a top aide's e-mails may erode her electoral firewall. Photographer: Daniel Acker/Bloomberg via Getty Images