The MAYDAY PAC is like David trying to beat Goliath in a fist fight. Don't fight on his terms, use the sling, idiot!
I believe the idea is that the money raised by "real people" will be used differently than that raised by corporations. The PAC is the funding mechanism which will be used to consolidate and coordinate "real people" who want to positively affect change. In other words: this is a campaign to raise the money for a sling.