Answer:

hope

Answer	Crossword Clue
HOPE	Wish
HOPE	Word before and after against
HOPE	It stayed in Pandora's box

HOPE	2008 political catchword
HOPE	What you might do when you cross your fingers
HOPE	2008 Obama catchword
HOPE	Cynic's lack
HOPE	Bill Clinton's Arkansas birthplace
HOPE	Arkansas town where Bill Clinton was born
HOPE	2008 campaign theme
HOPE	Cross one's fingers

HOPE	Optimist's feeling
HOPE	Word on a 2008 Obama poster
HOPE	One might lose it in a crisis
HOPE	Bad thing to abandon
HOPE	Rhode Island's motto
HOPE	Clinton's birthplace
HOPE	Crosby partner
HOPE	Desire

HOPE	What an optimist always has
HOPE	Pessimist's lack
HOPE	Chance for success
HOPE	One of Pandora's finds
HOPE	Crossed fingers symbolize it
HOPE	Aspiration
HOPE	Second of three virtues
HOPE	Long (for)

HOPE	Bill Clinton's birthplace
HOPE	... Diamond