Biloxi Sun Herald: Two of the biggest backers of the effort to suspend the state’s landmark climate change law contributed $1.5 million last week to the rollback initiative. But with about a week to go before the election, the Proposition 23 campaign appears to be losing the fundraising battle by a 3-to-1 ratio. On Friday, San Antonio-based refiner Valero Energy Corp. contributed $1 million to the Yes on 23 campaign, bringing its total contributions to the controversial ballot initiative to …