More prosaically, they extended it in exactly its present form for six months, when they could have let it expire and made the Republicans come back with a new secret-police act -- an act that would have hopefully faced more skepticism than the Patriot Act did, back in the days after 9/11 when Democrats and Republicans were trying to see who could be more hysterical.
Now, however, the Act represents the status quo and the Democrats will face the burden of painting a civil-liberties smiley-face on it.
Nice work, fellas.