Texas Sen. Ted Cruz's supporters have reportedly begun poll-testing lines of attack on Donald Trump. Cruz has largely avoided speaking ill of Trump, but may have begun looking for an opening to go after the reality television star atop the polls. Iowans received a message-testing phone call on Monday, RealClearPolitics reported, which sought answers about several possible lines of attack. The call asked respondents about whether Trump was a liberal pretending to be a conservative and his comments about Christianity. The call also reportedly raised the issue of Trump's positions on abortion, eminent domain and healthcare. Cruz, who often decries...