By Stefanie McIntyre and Donny Kwok HONG KONG (Reuters) - Hong Kong residents voted in a legislative council by-election on Sunday, with a "radical" pro-democracy candidate who was arrested in a recent riot running in what is being seen as a barometer of political tensions in the financial hub. The poll, to fill a single legislative seat vacated by a former pro-democracy politician, is being watched for signs of growing support...
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