Eric Fehrnstrom has it wrong (“Presidential predictions,” Opinion, Dec. 31). Immigration isn’t the key to the Republican primary race; it’s a symptom. The underlying cause is that tens of millions of Americans in the middle class have seen no recovery from the 2008 recession. These unfortunates are lashing out at anything or anyone who they feel has benefited unfairly. In this instance it’s immigrants, especially with Trump talking about so-called anchor babies and welfare for them. It remains to be seen whether there are enough of these middle-class voters to make Trump the nominee. Beyond that, such divisive rhetoric is almost surely a losing prospect.