How violent is US politics going to get? The panel talks historical parallels with 1968 and what might happen at a contested convention in Cleveland. Our special guest is Sean Trende from realclearpolitics, who explains why Americans have become such a mystery to each other and whether this marks a fundamental shift in the two party system. Plus it's the week of the Budget and we rake over the politics of austerity. How does George Osborne keep getting away with it?