Hi, Sherri. Actually that won’t make a difference. It’s not an actual problem–things like the Blue worked just dandy in early versions of iOS, but then about iOS 4 Apple changed it so that you couldn’t run most things just by using the USB part of the camera connection kit to connect things. It doesn’t matter how much power a device actually draws–if the iPad can detect something pulling power from the device via the USB only, it shuts it down. So it doesn’t matter whether or not the iPad itself is plugged in, unfortunately. What you suggest is logical, but Apple doesn’t always waste time on logic. 🙂
You can use a powered usb hub and that works, but the power cord limits where you and/or the mic can be.