A national group called Republicans for the Rule of Law is running ads aimed at moving Sen. Lisa Murkowski off the sidelines. They want her to criticize President Trump for asking Ukraine to investigate Joe Biden. But both of Alaska’s senators have said they see shades of grey in the Ukraine picture. This ad is showing up in Alaskans’ Facebook feeds. It’s focused, of course, on that call this summer, when Trump leaned on the Ukrainian president for an investigation of the Bidens. “We think she will be receptive to the message,” said Chris Truax, a San Diego attorney who...