Who watches the, you know...For those who may still care about this long dead horse, here's the book Moore ripped off large chunks of WATCHMEN's plot from:
Details vary, naturally, as Hawkey and Bingham were writing a science fiction political thriller, not a superhero comic. However, sequences such as the one detailing the murder of all the people working on the WILD CARD project (they're all on a plane, supposedly being sent to Bermuda for a vacation; the plane gets shot down by U.S. military aircraft) and, specifically, the ending (in which it is strongly hinted that word of the WILD CARD project will be released to the public, but not specifically stated) make it pretty clear that Moore had read this book prior to coming up with his WATCHMEN plot, and liked it enough to steal blatantly from it.
But you don't have to take my word for it. The book is out of print, but you can order copies pretty cheaply through the link above. Check it out for yourself.