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Who's hot in the search for a running mate?

CBSNews.com senior political editor Vaughn Ververs and the rest of our dot-com political team compiled a list for each Barack Obama and John McCain. The list is designed to reflect news, speculation, buzz, reporting ... and, well, even a hearty dose of guesswork.

Check out Obama's VP Hot Sheet.

Check out McCain's VP Hot Sheet.

And remember to check back - each list will morph and be updated as conditions warrant.

Twenty-four hours is a lot of time to fill. So, every day, cable channels have begun to play a classic political guessing game: Who will be picked as the vice presidential nominees.

The game is timeless. But so is its most important, and most forgotten rule: People who know don't talk; people who talk don't know.

For the rest of my Notebook, just click the monitor.

Although we've yet to narrow the presidential field down to two candidates, there's a lot of buzz about who's in the unofficial running for the No. 2 office in the country. Tonight on the CBS Evening News, Katie Couric will talk to a few of the most savvy experts on presidential politics to get a feel for who's on the short-list for both parties. And over at Horserace, CBS News.com Political Editor Vaughn Ververs breaks down the odds. A taste:

Picking a running mate is serious business in spite of the often carnival-like atmospherics that can accompany it. Clandestine meeting with prospective candidates, endless speculation and jockeying among various boosters aside, it's generally the first major decision made by two individuals auditioning for the job of running the country.

Check out the rest of Vaughn's profiles of the likely picks over at Horserace, including why Mitt Romney is an option for McCain, which governors will likely make the Republican short list and why Joe Biden isn't perfect for either Democrat.

The two highest offices in the country are filled in very different ways.

While the electorate and electoral college picks the president, the vice president is picked by an electorate of one.

For more on the process of choosing a VP, just watch my Notebook.