San Francisco's liberal mayor declared a "state of emergency" to try to deal with the city's "nasty streets."
How did it get so bad?
Journalist Michael Shellenberger's new book, "San Fransicko," argues that it happened because of progressive ideas.
"The town I love is sick," says Shellenberger in my new video.
He came to San Francisco when he was in his 20s to support social justice causes…