In this week's Time, there is an article talking about the fund rasing in US's 2008 campaign: "How Big Money Picks a Winner."
There is an idiom in the article that I can't really understand. Here is the quote:

"If I walked into Dodd's office with $250,000, I've hung the moon. For Barack? I'm the greatest thing since sliced bread. Hillary's office? Get in line."
The words in bold are where I'm lost. Could anyone explain this to me? Thanks!
From a dictionary:

"'Best (or greatest) thing since sliced bread' (informal) is used to emphasize one's enthusiasm about a new idea, person, or thing."
In case you are having trouble interpretting the entire paragraph, "Hillary" has so many people offering her money for her presidential campaign that $250,000 is nothing special. You "get in line" behind all the other people who want to give her money. But "Barak" does not have that many people giving him money yet, so you would be wonderful! (I've never heard the phrase "hung the moon" before, but apparently you would be even more special to Chris Dodd, who has very few people supporting his campaign compared to the other two.)

All three of them are running for president of the United States. Hillary is Hillary Clinton, and Barak is Barak Obama. (I'm not sure I have the spelling of his name right, but if he wins, I'll learn it pretty quickly!)
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I'm the greatest thing since sliced bread.

Here's the idea.

Bread used to be sold unsliced. Then someone thought of selling it sliced. That was considered to be, jokingly, one of the greatest and most original ideas ever. Any other very good/original idea/thing is thus said to be 'the greatest idea/thing since (the idea of) sliced bread.

It can also be said of a really great/smart person, as is done here. ie If I raise $250,000 for Barack, he will think I am great.

Best wishes, Clive
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But now, of course, we have bread machines (the bread from which is difficult to slice) and a plethora of wonderful hearty, good-for-you breads that are fun just to tear off, swipe with butter and enjoy.