Democrats stepped up their criticism of GOP gubernatorial nominee Charlie Baker on Wednesday over claims that as head of Harvard Pilgrim Health Care, he allowed 200 jobs to be outsourced to India, while Republicans denounced the attack as misleading. The spat over outsourcing, a potential hot-button issue with both candidates stressing their job-creating ability, began a day earlier when Democrat Martha Coakley's campaign released a photograph of a tuxedo-clad Baker accepting an ''Outsourcing Excellence Award'' in 2008.