http://beyondthechoir.org/diary/117/the-tactic-of-occupation-the-movement-of-the-99I want to suggest that the primary reason the tactic of occupation has resonated so far and wide is because it has served as a symbol about standing up to powerful elites on their own doorstep. To most people, the "occupy" in "Occupy Wall Street" essentially stands in for the F word! Millions of Americans were waiting for someone or something to stand up to Wall Street, the big banks, the mega-corporations, and the political elite. Then one day, a relatively small crew of audacious and persistent New Yorkers became that someone or something — became the catalyzing symbol of defiance we'd been waiting for.
Thus, Occupy Wall Street has served as something of a floating signifier — amorphous enough for many different kinds of people to connect with and to see their values within the symbol. Such ambiguous symbols are characteristic of new populist alignments. Many objects can serve as the catalyzing symbol, including actions (e.g. the occupation of Tahrir Square or of the Wisconsin State Capitol this spring), individual politicians (quintessentially Perón in Argentina), or even constructed brands (e.g. the "Tea Party"). As the above examples suggest, this phenomenon can be seen in all kinds of broad political alignments, across the ideological spectrum. In all cases though, a degree of ambiguity is necessary if the symbol is to catalyze a broad alignment. If the symbol's meaning becomes too particular—too associated with any one current or group within the alignment—it risks losing its powerfully broad appeal.
It's important to note that although the signifier is floating (i.e. not peg-able), it is not empty of content. It has to be meaningful enough to resonate. Moreover, different symbols tend to pull things in different directions. Candidate Barack Obama as floating signifier, for example, pulled a lot of grassroots energy into what has turned out to be an establishment-reinforcing direction. Occupy Wall Street as floating signifier, on the other hand, seems so far to be pulling a lot of establishment forces in the direction of the fired-up, social justice-oriented grassroots.
When a challenger social movement hits upon such a catalyzing symbol, it's like striking gold. One might even argue that broad social movements are constituted in the act of finding their floating signifier. Hitherto disparate groups suddenly congeal into a powerful aligned force. Momentum is on their side and things that seemed impossible only yesterday become visible on the horizon.