Assigning 2 (or more) GMs in a campaign

Hello, I've just started using Roll20 over Google hangouts and I have to say it's leaps and bounds ahead of Tabletop forge. With that said, my group has a system where the GM in the campaign rotates and there are at times two players that could use GM tools such as the ability to add Tokens and Maps from the Art Library. Is there any way to elevate players in a session to GM status or start a campaign with with multiple GM accounts?

Yes, go to the launch page of your campaign. Hover the mouse over the player you want to elevate to GM. Select Promote to GM. If the person is currently in the campaign they will need to refresh. - Gauss

Thanks for the reply, does this work even if I'm running the game over Google Hangouts?

Yup.

Will this result in just the other player being a GM? Or will you have both players be GMs?

Both players will be GM's, however... there is an option to re-log in as a player.