I haven't seen any verification to show this is the case. I do think there was a Dem flipover factor, or Dems who knew their guy had no chance and wanted to make sure the "Tea Partier" didn't win.
Good points. That buffoon McAdams only got like 24% of the vote, so it would indicate many Democrats probably ended up voting for Lisa.
Republicans make up much more than 34% of the electorate in Alaska, so it seems clear that some republicans voted murkowski, as well as some independents.