How nasty are Trump and Cruz going to be to each other?

It is a tough situation. They are going after the same voters. To the extent that they say anything substantive, there is not much difference. So far what we have is Trump saying that Cruz is of Cuban heritage and was not born in the U.S. Cruz comes back saying that Trump is a New Yorker. Is that the best that they can do, trade stereotypes? How pathetic.

Being a Democrat, I want to see tooth and claw fighting between Cruz and Trump, so that whoever gets the nomination will be softened up for the Democratic nominee.