MXL USB Mic on an iPad 2?
My concern would be if the MXL USB mic expects to draw electrical power through the USB port. In that case the iPad 2 and the iPad Camera Connector Kit certainly would not provide enough power for the microphone. You should go to the MXL web site and check their support information.

The Alesis IO Dock Pro, US$200.00, provides professional-quality audio and MIDI interfaces to the iPad 2, but only interfaces MIDI over USB, not audio over USB like with the MXL microphone you describe. The Alesis is designed to work with conventional condenser microphones with an XLR audio cable, and it provides phantom power.