Hillary Clinton on ''Hard Choices'

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At a book signing in Manhattan for the first stop of a nationwide book tour, Hillary Clinton seemed to make a not-so-subtle hint about her future, saying "hard choices" isn't just about tough decisions of the past.

"And we have a lot of hard choices on how to continue to lead the world, to solve problems and to protect us and the rest of humanity," said the former Secretary of State.

It was something the crowd of more than 1,000 who had waited since sunrise obviously wanted to hear. Indeed, many at the signing were overheard encouraging Clinton to run for president again - a decision she said she'd make later this year.

While the book doesn't deal with her next campaign, she did write about her last one - including a charge that the 2008 Obama campaign wanted her to attack Sarah Palin.

"The day she was nominated, the Obama Campaign did contact me and asked me if I would attack her," she told NBC's Cynthia McFadden. She said she asked them, "'Attack her for what? For being a woman? Attack her for being on a ticket that's trying to draw attention? There'll be plenty of time to do what I think you should do in politics, which is draw distinctions!'"

"Hard Choices" is mostly about Clinton's years as Secretary of State, but its timing follows the path of past presidential hopefuls -- write the book, then run the race.