ADN/AP by Dan Joling (NGP Photo).  Alaska Gov. Sean Parnell has had 16 months on the job as a replacement for Sarah Palin and the Republican is seeking a full four-year term. Democratic Ethan Berkowitz hopes Alaskans want a change.Parnell continues to embrace Palin’s plan for a proposed pipeline to move North Slope natural gas to market. The law awarded an exclusive state license to build the pipeline and $500 million in state incentives to get the $30 billion project moving. Parnell claims that both the state licensee, TransCanada Corp., and a competitor, Denali-The Alaska Gas Pipeline, a joint venture of BP PLC and ConocoPhillips, have conducted successful open seasons aligning gas sellers with pipeline companies.