Looking To Setup 2 Webcams Need Help??

What is the easiest way to run 2 webcams at the same time and then select the audio from one of the webcams?? I want to be able to stream both of these webcams at the same time on a site like Ustream acting as like one feed not 2.

I Googled this and have no idea. Perhaps there is a specialized studio streaming version software that can do it. Or you could use a Sennheiser wireless mic or other manufacture to stream audio from.

I figured out how to do it with Xsplit I have the Microsoft Lifecam Studio as the main cam on the screen and the Logitech c615 in the lower right of the screen it only takes up like 1/5 of the box and feed the audio from the c615