Ever heard of Saul Alinsky?

You better: Obama has learned Alinsky's lessons well: 

After Obama took office, the pundit class found itself debating the ideology and sensibility of the new president — an indication of how scarcely the media had bothered to examine him beforehand. But after 100 days, few observers can say that Obama hasn’t surprised them with at least one call.[SNIP]...

As conservatives size up their new foe, they ought to remember: It’s not about liberalism. It’s about power. Obama will jettison anything that costs him power, and do anything that enhances it — including invite Rick Warren to give the benediction at his inauguration, dine with conservative columnists, and dismiss an appointee at the White House Military Office to ensure the perception of accountability.

Alinsky’s influence goes well beyond Obama, obviously.