In the Denver terrorism investigation (see my column here, and this follow-up on the Corner), the Justice Department has upped the ante, charging Najibullah Zazi with bombing conspiracy. The Wall Street Journal report is here.

Unfortunately, Zazi is, for the moment, a conspiracy of one — one charged defendant, that is, not one involved suspect. There could be lots of the latter, as I’ve noted before and as my friend Steve Emerson warns.