If President Trump doesn’t win re-election, he might want to consider a career as a bookseller. His stinging criticism, along with threatened legal action, have made “Fire and Fury: Inside the Trump White House” by Michael Wolff the surprise must-have book of the new year. Evidence of that could be found at libraries and bookstores around southern Maine on Friday, as readers searched, mostly in vain, for copies. The book had originally been scheduled to go on sale Tuesday, but publisher Henry Holt moved up the date to Friday because of “unprecedented demand.” The rushed release, combined with a massive snowstorm Thursday that delayed deliveries, meant many people looking to put their hands on a copy of the book Friday were out of luck. “I assumed because of all the news, it was already out,” said Bonnie Spilsbury of Portland, after she was unable to get a copy at the Books-A-Million store in South Portland on Friday afternoon.