Connecting two microphones to USB ports?

In october my internet radio station will be doing a live broadcast for a local event. We would like to be able to do interviews with people but want to have 2 microphones connected to the laptop so people won't have to lean over the computer to be heard.
Is there a way to do this with USB? if so, how? If not, how can we achieve this?

This -possibly- could be done with two USB mics, it would take creating and "Aggregate" audio device, see these links for an explanation and tutorial on creating the "aggregate" audio device.
http://www.apple.com/pro/techniques/aggregateaudio/
http://support.apple.com/kb/HT1215
However... USB mics can be problematic, trust me on that. It could work, but there's no guarantee.
If it was me, I'd purchase a small mixer, and just use the 1/8" line-in jack on the Macbook. A small mixer could easily mix two microphones allowing independent volume control plus a mixer has treble/bass EQ so the mics could be adjusted to have the same tonal balance. The other plus is a mixer will allow the use of better mics as it will have both high and low impedance inputs.
This is the type of mixer I'm talking about.
http://www.zzounds.com/item--BEHXENTX802
Not necessarily the place to buy or the type of mixer... just an example.
pancenter-

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