Scottish Health Secretary Humza Yousaf is leading the race to replace Nicola Sturgeon after former frontrunner Kate Forbes triggered a major row over her views on gay marriage.
Ms Forbes sparked a furore only hours after announcing her candidacy by telling an interviewer that her conscience wouldn't allow her to vote in favour of same-sex marriage.
A string of backers withdrew their support, including Public Finance Minister Tom Arthur, Children's Minister Clare Haughey and Health Committee convener Gillian Martin.
