All social entities or movements need dreams, which can be defined as an indispensable capacity to envision a future for themselves that considers both the practical means at hand and a higher ideal. Societies that do not dream are doomed to die.

The left faces a new challenge that is leaving its activists troubled. Over the past few years, many high-profile leftist figures, writers, and politicians have turned right. They defected to the other side, and embarrassed leftists don’t know what to do about it.

In an op-ed in The New York Times, columnist Michelle Goldberg asks some soul-searching questions about what is causing the shift and why it’s important. She cites an extensive report in the well-known leftist publication, In These Times, which tells the stories of turncoats like former environmentalist Robert F. Kennedy Jr., Occupy Wall Street activist Matt Taibbi or liberal feminist writer Naomi Wolf. …