Transcripts for KPIX CBS Evening News With Scott Pelley 2012

fi field office near des moines, strawn says early voting helps campaigns improve their focus. >> well, anybody that tells one of our volunteers they're bpporting mitt romney, you bet you, we want that vote cast as ibon as possible to make sure we can start working on those other iowans who haven't made their decisions yet. >> reporter: democrats are following a similar strategy. >> are you guys planning on voting early in this election? >> reporter: sue dvorsky chairs the state democrats. rees it allow you to streamline your message at those people in the middle? >> i think that's a functional and practical result of it. >> reporter: do you think participation will be higher this time around than in 2008? >> all the signs point to it. >> reporter: as of thursday in wawa, 103,000 democrats requested early vote ballots, compared to 17,000 republicans. but early voting is not always a great guide. back in 2004, scott, john kerry received more early votes from iowa than george w. bush, but bush wound up winning the state by 10,000 votes when all the

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