Why, yes. Yes Newt did appear in Al Gore's campaign last year.
From Think Progress:
Last year, former House Speaker Newt Gingrich appeared in a "We Campaign" advertisement for former Vice President Al Gore's Alliance for Climate Protection to promote the reduction of greenhouse gas emissions. Speaking alongside Speaker Nancy Pelosi (D-CA), Gingrich said, "We do agree, our country must take action to address climate change," adding, "if enough of us demand action from our leaders, we can spark the innovation we need." Watch it:read more | digg story