After many years of electoral disappointment, the Democratsare now the front runners in the New York mayoral race

On Tuesday, New Yorkers will vote in primary elections to choose the Democratic and Republican candidates for the city’s directly elected mayoralty. Tony Travers writes that while the Democrats have been out of power for two decades, in a city that is generally supportive of them, they have now emerged as front runners to win the vote in November, most likely in the form of Bill De Blasio. He argues that cities in Britain which also now have directly elected mayors, such as London, should watch the contest and its results with interest.