This happens so often, it's becoming a tradition. Call together a bunch of people to descend on Washington to discuss, lecture on, protest or otherwise promote the theory of man-made global warming and you can bet they will be snowed out.
This last protest, aimed at shutting down Washington by demanding the closing of the Capitol Power Plant, which heats a number of government buildings, was particularly ironic. Many who had planned to join the protest couldn't get there because their flights were canceled due to the storm. Washington was pretty much shut down anyway - not due to the protest, but due to a March 1st blizzard that blanketed the entire east coast with snow and ice.
Even Nancy Pelosi couldn't make it due to a cancelled flight. Imagine, the Speaker of the House missing a chance to demand that government buildings be closed...
This latest debacle in the "climate change" agenda (remember, it's not global warming anymore, since the Earth hasn't warmed since 2001) is just another example of the famed "Gore Effect". The Gore Effect can be defined as:
The phenomenon that leads to unseasonably cold temperatures, driving rain, hail, or snow whenever Al Gore visits an area to discuss global warming.
Maybe it's not just irony, perhaps it's something more. Perhaps it's just Mother Nature having her best laugh at the people who claim to control her. I know I giggled.