Guardian: Alaska Gov. Sarah Palin is seen as a strong advocate for opening new areas to oil drilling, including the Arctic National Wildlife Refuge, but has taken a hard line in negotiations with oil companies and raised taxes on the state’s energy producers. Palin, named by Sen. John McCain on Friday as presumptive Republican vice presidential candidate, has sparred with oil giants Exxon Mobil Corp, ConocoPhillips and BP Plc since her election as governor in 2006. But industry experts …