The video, titled "Bill White Supports Cap & Trade," shows clips of White discussing climate change and tries to tie White to the separate but related issue of Obama's cap-and-trade legislation. The ad cites a memo White wrote to Obama in November 2008 advising him on energy policy. White's campaign has insisted that he does not support cap and trade and that the letter should not be read as an endorsement of such legislation.
Perry has been clear in his belief that cap and trade would "devastate" the Texas economy. Here's the clip:
UPDATE: White spokeswoman Katy Bacon says, "Bill has never been in favor of cap and trade." She notes that a similar claim was rated "Pants on Fire" by Politifact Texas. In an e-mail, she said that White's email to the Obama administration was "basically suggesting an entire package and saying multiple times that the administration should not pursue cap and trade but instead pursue these packages he's suggesting. This was an email written days after an election in which John McCain and Barack Obama both stated their support for cap and trade - it would not make sense not to even acknowledge that such a proposal would be considered."