For more on High Altitude Electromagnetic Pulse (HEMP) from nuclear detonation here is the Department of Homeland Security report on the estimated affects if a hostile use of a HEMP was detonated now.
Apparently he was an advocate for financial austerity, so his name became connected with cheap or discount things. A silhouette was an affordable type of portrait.
This particular video actually includes 2 songs. After Tuesday Afternoon is the next song on the album, Evening Time to Get Away. Their album Days of Future Passed is a concept album where each part of the day has its own song.