Here's a quote from a Philadelphia Inquirer article from March 12, 2008:
"...priority No. 1 for his campaign is registering as many voters as poossible - at least 100,000- before the March 24 deadline....
While Obama's goal is to expand the Democratic electorate in Pennsylvania, Clinton is hardly as focused on doing the same. The New York senator's campaign said it had no similar voter registration drive because that is not central to its strategy ...
In Philadelphia ... the number of registered Democrats grew by 6,079 between Feb. 11 and Monday."
The article also says that there are 327,000 undergraduate college students in PA. which are being targeted by Obama with groups on 35 college campuses. The article described how students from other states (such as Connecticut and Massachusetts)are helping with those efforts.
The article was entitled "Obama's Keystone Strategy: Register Voters."
(I live in PA. and had 3 very polite high school volunteers for Obama stop me on the street and ask me if I wanted to register.)
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I quoted the paper copy of the paper, but could not find a direct link to the complete article. Here is a related article:
http://www.philly.com/philly/news/homepage/16590046.html