The Nordic model mixes welfare and economic success, but Sweden's social democrats are at risk from a loss of confidence. The prime minister has been in power nine years and the people are tired of him. They say their not well-liked leader should have made way for someone else by now. A new conservative challenger to this long-standing government of the left is a young dynamic moderate, uniting the fractious forces of the right. So a social democratic government risks losing to that most lethal human instinct - boredom. The age-old "time for a change" impulse may replace a successful...