OTTAWA (CP) - Paul Martin supporters are targeting some Liberal MPs in a bid to purge the party of any pockets of dissent against his leadership, insiders say. Martin denied the charge Thursday. Party sources and MPs said numerous Liberals are being targeted in their home ridings by challengers vying for local nominations at pre-election meetings expected early next year. The movement took stride after Martin's very first day as Liberal leader last month when he announced he would halt the current practice of protecting sitting MPs. He said it is an attempt to make the process more democratic. Critics...