In one bellwether Iowa county, Democrats upbeat

Doug Simkin has a little extra bounce in his step as he travels around this congressional district on the eastern edge of this politically pivotal Midwestern state.

That's because like a lot of people here, including some Republicans, the 40-year-old Democrat senses a shift in the political landscape toward the Democrats heading into upcoming November congressional elections and, beyond that, the 2008 presidential contest.

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