 South Australia achieved a AAA credit rating under the Rann Labor government, prompting Business SA chief executive Peter Vaughan to praise Labor's economic management.Rann was often the most popular Premier in the country, with his approach to government generally moderate and crisis-free.Following the 2006 election landslide where Labor was re-elected with a historic 56.8 percent two-party-preferred vote, Newspoll early in 2007 saw Rann peak at a historic 64 percent Preferred Premier rating with a historic 61 percent Labor two-party-preferred vote.