One of the puzzling questions about Barack Obama's presidency is how the post-partisan candidate of 2008 became the polarizing chief executive of 2010. The answer may be surprising. He was far more polarizing from the start than many recognized. His choices in office and his opponents' responses have only hardened that divide.
During the campaign, Candidate Obama talked about the need to put the partisan divisions of the past behind. His victory fostered discussion about whether the country had turned a corner after years of bitter partisanship. In the glow of his inauguration, some people heralded a new era in American politics.