Ted Cruz is doing his best to avoid Donald Trump's birtherstyle attacks, but it's not easy when you're on a bus tour with a pack of reporters questioning you about it every chance they get. And when another rival candidate echoes the questions about whether Cruz is really eligible to be president, given his Canadian birth. And when a nemesis of yours in the Senate lends credence to the question, too. So far, Cruz has dismissed the growing miasma the same way he has done in the past. (Trump has also raised questions about Cruz's evangelical Christianity and claimed Cruz.)...