From the preface:

"Most important, we examine and reject the idea of an ideological
“center.” It is not made up of “moderates,” nor is it defined
by issues spread across a left-to-right spectrum. Instead, the
“center” is made up of biconceptuals. The idea of biconceptualism
is essential to understanding—and changing—American politics.
We explain why progressives can and should talk to biconceptuals
in the same way they talk to their base.

A cautionary note about this handbook: Advocacy groups
running specific ad campaigns, candidates running for office, and
policy makers all have short-term needs—they want language for
the next ad, for tomorrow’s speech, and for the upcoming election
campaign, and they want sound-bite responses to this morning’s
charges by the other side. This handbook is not about
quick-and-dirty, short-term fixes to immediate tactical problems.
It is about long-term strategy, a strategy for returning America
to its progressive ideals. It is about changing the way we do politics.
It is about helping America get in touch with its progressive
roots.

We hope this handbook begins a process of creating a language
of a renewed liberalism. In its online version, it will form
the basis of the Rockridge Progressive Manual Project, designed
to extend this handbook, step-by-step, to all issue areas, and to
do so interactively, with an ongoing dialogue, a national conversation,
with grassroots progressives. This handbook is also the
seed of the Rockridge Action Network, a network of activists—
individuals and groups—who want to speak out on issues and
place progressive ideas and values before the public.

Thinking Points: Communicating Our Values and Vision