A Lambeth Palace press release says:
The Archbishop of Canterbury, Dr Rowan Williams, has issued a pre-election open letter, urging party leaders to avoid political campaigns based on the exploitation of fear.
Dr Williams argues that although negative campaign strategies may make headlines they do not determine the outcome of elections and that politicians should focus instead on offering long-term solutions to deep-rooted challenges.
Dr Williams goes on to identify four such issues: the environment, international development and the arms trade, youth and family policy, and criminal justice reform.
The letter can be read in full here.
Update The BBC has a report which includes a link to a video clip including an interview with RW.
The Church Times has a report on its website, not in the paper edition: Campaign fairly, Archbishop tells party leaders
Stephen Bates in the Guardian has Fear must not be a campaign tool, says Williams
and there is also Attacks on Tory politics of fear
Jonathan Petre interprets the letter a different way in the Telegraph Archbishop says make marriage election issue
The Independent had Archbishop warns party leaders not to exploit voters’ fears.