David Mundell, who is contesting the Dumfriesshire, Clydesdale & Tweeddale seat, says he is "optimistic" the south of Scotland could turn Conservative.
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It's now in its 100th year and pledging to double the number of people it supports to 100,000.
The pensioner was riding with in a group when his motorbike left the road and collided with a tree.
The 17-year-old was pronounced dead at the scene.