of Representatives and the day of the election. Prime Minister Howard opted for a 39-day campaign. The prime minister of the day chooses the election date and requests the governor-general to dissolve the House and issue the writs for the election. On 14 October, John Howard gained the agreement of the governor-general, Major-General Michael Jeffery, to dissolve the House of Representatives and hold a general election for the House and half the Senate on 24 November 2007. During the last term of parliament before the 2007 election, the deadline for new voter enrolment was brought forward from 7 working days after the issue of the writ to the same day. When the election was announced, the writ was not issued the next day, but on the following Wednesday. This kept the roll open for three days, during which 77,000 enrolment additions were processed. Pre-election issues Roy Morgan polling in June 2007 reported WorkChoices was a reason for Labor party support, and a fear of union dominance and support for Coalition economic management policy as the biggest reasons behind the Coalition vote. Several big business organisations, including the Australian Industry Group, declined a request from the Prime Minister to run advertisements to counter the union-funded campaign. The share of voters concerned about industrial relations grew from 31 per cent to 53 per cent in the two years to June 2006, with around three-fifths of voters backing Labor's ability to handle the issue over the Liberal Party. A Newspoll released in June 2006 reported health and Medicare were the most important issue for voters; 83 per cent of respondents rated it "very important". Other key issues included education (79 per cent), the economy (67 per cent), the environment (60 per cent) and national security (60 per cent). Taxation and interest rates, key issues in previous campaigns, were rated very important by 54 per cent and 51 per cent respectively. Immigration, a key issue in 2001, scored 43 per cent. The poll showed that voters considered Labor marginally better-placed to handle health and education, and gave the government strong backing on the economy and national security. Kevin Rudd promised Labor would introduce a greenhouse gas emission reduction target of 60 per cent by 2050, ratify the Kyoto protocol and introduce a mandatory renewable energy target (MRET) of 20 per cent by 2020. The Howard government reiterated their position of not ratifying the Kyoto