The same poster who added the "Mama Mama...Obama" video to YouTube, schultzchr, also added these two videos of protestors chanting/singing during that same Sarah Palin protest rally in Pittsburgh, Pennsylvania on 19/10/2008:

http://www.youtube.com/watch?v=2rn-oGVb_0o&feature=related
We Will Barack You

and

http://www.youtube.com/watch?v=LBNBxHn53hs&feature=related
Everywhere We Goooo....People Wanna Knoowwww...

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The "We Will Barack You" song is a take off of the still very popular pop song "We Will Rock You". That song wa recorded in 1977 by Queen. In this video, the group sings in unison. The only words captured by the video are "We will we will Barack you", though some of the group may be singing "We will we will rock you. Barack you".

As a point of information, in the USA, this song is widely used as a children's cheerleader cheer.

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"Everywhere We Go" is actually an introduction, bragging chant and not a protest song. The chant has a call & response pattern. The group exactly repeats what the soloist said. The words as chanted in that video are:

Everywhere We Go
Everywhere we go-o {"group responds "gr"}
People wanna know-o {"gr"}
Who we are-r {"gr"}
So we tell them {"gr"}
We are the union {"gr"}
The mighty mighty union {"gr"}
The American union {"gr"}

-snip-

This chant is widely used in the USA by cheerleaders, by parading drill teams and other organizations.

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I should also note that in each of these videos, a drummer accompanies the group chanting/singing. I'm not sure what kind of drum it is, but it's one that is usually found in drum & bugle corps.