What If It Rained on the Tea Party Parade?

My latest Bloomberg View column with Betsey is all about the Tea Party.  Well, actually, it’s really about some superb research about the Tea Party, by Andreas MadestamDaniel ShoagStan Veuger and David Yanagizawa-Drott.  Their big question: “Do Political Protests Matter? Evidence from the Tea Party.”  We know that lots of people turn out to Tea Party rallies. But does it really change anything?