Addressing this very issue.
It's a little lengthy, but it's well worth the read (assuming your question was legitimate).
http://www.newyorker.com/reporting/2007/05/07/070507fa_fact_macfarquhar?printable=true"There are three things that Democratic political candidates tend to do when talking with constituents: they display an impressive grasp of the minutiae of their constituents’ problems, particularly money problems; they rouse indignation by explaining how those problems are caused by powerful groups getting rich on the backs of ordinary people; and they present well-worked-out policy proposals that, if passed, would solve the problems and put the powerful groups in their place. Obama seldom does any of these things. He tends to underplay his knowledge, acting less informed than he is. He rarely accuses, preferring to talk about problems in the passive voice, as things that are amiss with us rather than as wrongs that have been perpetrated by them. And the solutions he offers generally sound small and local rather than deep-reaching and systemic."
"Obama’s voting record is one of the most liberal in the Senate, but he has always appealed to Republicans, perhaps because he speaks about liberal goals in conservative language. When he talks about poverty, he tends not to talk about gorging plutocrats and unjust tax breaks; he says that we are our brother’s keeper, that caring for the poor is one of our traditions. Asked whether he has changed his mind about anything in the past twenty years, he says, “I’m probably more humble now about the speed with which government programs can solve every problem. For example, I think the impact of parents and communities is at least as significant as the amount of money that’s put into education.” Obama encourages his crossover appeal. He doesn’t often criticize the Bush Administration directly; in New Hampshire recently, he told his audience, “I’m a Democrat. I’m considered a progressive Democrat. But if a Republican or a Conservative or a libertarian or a free-marketer has a better idea, I am happy to steal ideas from anybody and in that sense I’m agnostic.” “The number of conservatives who’ve called me—roommates of mine, relatives who are Republicans—who’ve said, ‘He’s the one Democrat I could support, not because he agrees with me, because he doesn’t, but because I at least think he’ll take my point of view into account,’ ” Michael Froman, a law-school friend who worked in the Clinton Administration and is now involved in Obama’s campaign, says. “That’s a big thing, mainstream Americans feeling like Northeast liberals look down on them.”"