The simmering tension between Republican presidential rivals Marco Rubio and Ted Cruz has finally bubbled over.
On Tuesday morning, top advisers to each candidate pounded the other with the best ammunition at their disposal. The Rubio campaign slammed Cruz for a weak national security record, while a pro-Cruz group unveiled a vicious ad targeting Rubio on the issue that could become his greatest weakness in the Republican primary: immigration.
http://www.motherjones.com/politics/2015/11/rubio-cruz-war-has-begun
