News: Jerry Brown's First TV Ad

Anyone else notice how most of Whitman's ads run for about 45 seconds to about a minute, while Brown's run for about 30 to 45 seconds?

Brown's low amount of ads could be because he does not have as much money as Whitman, or it could just be part of his ideology; why spend thousands, even millions, on ads when he could use that money for more important parts of his campaign?