Coalition MPs in marginal seats are facing a campaign by the cashed-up Maritime Union, which claims the Turnbull government is overseeing a jobs market in which people can be "sacked for being Australian". An advertising blitz beginning on Monday will pinpoint some of the Coalition's most vulnerable seats in areas affected by the declining coastal shipping industry. They include the Victorian electorate of Corangamite, held by Liberal Sarah Henderson (pictured with Malcolm Turnbull). The MUA's TV and radio campaign focuses on the experience of the crew of the MV Portland. In   January, after 27 years of hauling alumina between Western Australia and Victoria for mining giant Alcoa, the MV Portland's Australian crew were marched off the ship after a two-month on-board protest. The mainly Filipino crew of the replacement ship are paid about $150 a week, according to the International Transport Workers Federation. Despite the Senate blocking former deputy prime minister Warren Truss' bid to open the coast to more foreign-flagged vessels, the government continues to issue one-off, "temporary coastal licences" for foreign-crewed ships.