This development, perhaps one of if not the biggest of the 2016 presidential campaign so far, comes as Walker has taken a commanding lead in polls in all three of the first GOP primary states: Iowa, New Hampshire, and South Carolina.

The reason why this development is so significant is that the two establishment-backed candidates, Sen. Marco Rubio (R-FL) and former Florida Gov. Jeb Bush, both have an in-depth understanding of the immigration issue and come down on the side that supports special interests’ desire for a massive increase in legal immigration that hurts American workers.

Meanwhile, Sens. Ted Cruz (R-TX) and Rand Paul (R-KY)—who like Walker make up the more grassroots conservative side of the field—don’t really weigh in on the legal side of the immigration issue. So as Walker continues to gain traction as a potential candidate, and readies himself for a launch, it’s quite clear he’s making a significant effort to learn what he now clearly understands is one of the most under-appreciated angles of the jagged razor-edge issue of immigration—the angle that polling shows can help him clear the GOP field and easily eliminate Rubio and Bush, whose pro-open borders positions stand against American workers.