Jonathan Bernstein advances a kind of Bad Man theory of contemporary American politics -- the bad man being Newt Gingrich, the GOP's Faust. The problem with U.S. politics, he argues, isn't structural, and it's not political polarization per se:
No, the problem is the Republican Party, which has developed a weird and dysfunctional set of incentives along with the legacy of a handful of role models they would be better off without. There’s the race to be the True Conservative, which requires staking out ever-more-crazy positions in order to differentiate from RINOs and squishes – and the reaction by mainstream conservatives who are terrified at losing their conservative credentials and therefore cling as close as possible to the nuttiest radicals out there. There’s the lucrative conservative marketplace, which thrives on incivility and conflict – that’s one set of perverse incentives – and which also thrives when Democrats are in office, which is another set of perverse incentives. There’s the conservative closed information feedback loop, with Republican Party actors and politicians failing to see the U.S. that the rest of the nation sees.