Donald Trump and Texas Sen. Ted Cruz continued to joust for primacy heading into the South Carolina primary next weekend, foregoing policy differences for name-calling and insults. Trump called Cruz "nuts," "dishonest" and "an unstable person," while Cruz questioned both Trump's conservative credentials and whether he had the temperament to be president. Cruz is trying to weaken Trump's standing among South Carolina's social conservatives and evangelical Christians, a key voting bloc in Saturday's contest. "The people of South Carolina want a consistent conservative they can trust," Cruz told reporters before his rally in Aiken. About the same time at a...