It's all about the trams. Five years ago, the LibDems and SNP entered a fragile coalition to steer Edinburgh through one of the largest infrastructure crises in the country.
But last year, the SNP won five out of six of the Edinburgh seats at Holyrood, with Malcolm Chisholm of Labour taking the last one, and at council level it is the Nationalists' group leader, Steve Cardownie, who has been one of the most outspoken against trams, a position that could give the party a boost this time round.
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