RACHEL MADDOW (CO-HOST): I will say if you're a Muslim-American. if you are from a family of immigrants, if you are a Mexican-American, as 30 million Americans are, this win tonight by Donald Trump, it may be chilling. This is going to be international news tonight, not just because he's a big outsized personality and a political novice who's maybe on track to get the Republican nomination. This is going to be seen international news tonight because this is going to be seen worldwide as the ascendance of a kind of nativism in American Republican politics that is usually confined to the Pat Buchanan fringe and the George Wallace fringe. 

Previously: 

Media Hype A “Subdued,” “Toned Down” Donald Trump As He Continues To Make Extreme Comments

Limbaugh Praises Trump's Latest Attack On Ted Cruz

CNBC's Awful Trump Interview Highlights Its Larry Kudlow Problem