Everything you need to keep track of tonight's caucuses

There's one story in the news today, and it's Iowa. The first-in-the-nation caucuses officially kick off the 2012 campaign season. We've got a predictions thread going -- why not take a chance and venture a guess? But first, you may as well catch up on all the latest news and polling so that you can make as educated a guess as possible. Twenty-five delegates to the national convention are at stake tonight, but they are allocated proportionally, so winning a quarter of the vote will only garner a candidate seven delegates.

What's going on here?

If you're not clear on how caucusing works or how it's different from primary voting, here are the basics:

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