Labor made it evident that a fresh approach was needed; however he lost along factional lines. Premier In late July 2011, senior figures within Labor had indicated to Rann that both the left and right Labor factions had agreed to replace Rann with Weatherill as party leader. In early August 2011 Weatherill's attempts at contacting Rann on his trade mission to India had been met with silence, leaving the party leadership in limbo until Rann's return to Australia. Weatherill refused to rule out challenging Rann in a caucus ballot if he did not stand down on his return to Australia. Rann eventually resigned at the behest of factional bosses, with Caucus endorsing Weatherill as his successor. Weatherill was then sworn in as the 45th Premier of South Australia on 21 October 2011. First term In 2011/2012, Weatherill and then Environment Minister Paul Caica brought together irrigators, business, River Murray communities and South Australians more generally to fight for a better deal for the River and South Australia. The end result was an additional commitment of 450 gigalitres of environmental water under the Murray Darling Basin Plan. The 2012–2013 budget was Weatherill's first, with Jack Snelling as treasurer, and came with deep cuts aiming to achieve major savings. Some of this was through suspension of major works programs such as the electrification of the Gawler and Outer Harbor rail lines, and redevelopments of Modbury Hospital and Queen Elizabeth Hospital. Notably, the AAA credit rating achieved under the Rann government was lost, downgraded to AA+ in October, a move foreshadowed by Snelling. Other actions during Weatherill's first 12 months included a deal to increase shopping hours on public holidays, supported by SDA secretary Peter Malinauskas and Business SA chief executive Peter Vaughan, and Weatherill's support for a Greens-initiated gay marriage bill following the announcement of Tasmania's planned changes. The South Australian Health and Medical Research Institute (SAHMRI) was opened by Jay Weatherill in 2013, a building often referred to as "the cheese grater" due to its exterior design. It is a health and medical research institute housing more than 700 researchers, and was the first stage of a new health and bio-medical precinct on North Terrace in Adelaide. Weatherill allowed a conscience vote for the Greens' 2013 South Australian Gay Marriage bill in August 2012. However, the bill was frustrated by Labor's conservative Catholic right, as well as a lack of support