The Scottish National Party hopes to repeat its success in Glasgow East and snatch the seat from Labour - it is seen by some as another test for Gordon Brown's leadership.
BBC: Brown 'keen' to visit Glenrothes
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He said also that during Gordon's Brown time at the Treasury, older Scots had to endure the indignity of a means test to get a decent pension.
BBC: NEWS | UK | Scotland | SNP chief Salmond rounds on Brown
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Asked about Mr Johnson's victory in an interview with the BBC, Prime Minister Gordon Brown said he wished him well but the "test" was now what Mr Johnson would do in the job.