An aide to Wisconsin Gov. Scott Walker's (R) nascent presidential campaign resigned on Tuesday after conservatives and Republican officials took issue with a series of critical tweets she posted about the Iowa caucuses. Liz Mair, a veteran Republican strategist who holds moderate positions on social issues and immigration reform, announced that she is stepping down from her post as the governor's social media point person because the furor had become too much of a distraction from Walker's likely run for president in 2016. "The tone of some of my tweets concerning Iowa was at odds with that which Gov.