Their rating increased from 12% to 20% between February and the end of last week.
The support has leaked from the SNP, whose backing dipped by six points to 26%, and the Tories, who dropped from 17% to 14%.
The LibDems’ popularity in Scotland has shot up by eight points in a poll conducted over the period that included Nick Clegg’s highly praised performance in the UK party leaders’ TV debate.
Their rating increased from 12% to 20% between February and the end of last week.
The support has leaked from the SNP, whose backing dipped by six points to 26%, and the Tories, who dropped from 17% to 14%.
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