This is a PDF file on Scribd that is evidently coming from buzzfeed.  It contains all of what is purported to be John McCain's opposition research on Mitt Romney.

I've read about the first 20 pages.  It is fascinating.

For example:

 In 1994 Senate race, Romney backed Brady bill and assault weapons ban, saying “I don’t line up with theNRA” and “that’s not going to make me the  hero of the NRA.”

Romney called Clinton crime bill  “a big step forward.”

As governor, Romney quadrupled gun licensing fees  and vowed not to “chip away” at tough  gun laws

In 2004, Romney signed permanent state-level ban on assault weapons that was mirrored after federalassault weapons ban.

And under Foreign Policy:

Romney has no foreign policy experience.

And under economics:

State spending increased at well over rate of inflation under Romney's watch [as governor]

Under Romney, Massachusetts dramatically underperformed the rest of the nation in terms of job growth.

and

Romney left his successor to fill a budget deficit exceeding $1 billion.

Romney raised state fees and taxes more than $700 million per year, according to independent experts.

Fascinating stuff.  I plan a full reading when I get home tonight.