is senator warren republican
On September 14, 2011, Warren declared her intention to run for the Democratic nomination for the 2012 election in Massachusetts for the U.S. Senate. The seat had been won by Republican Scott Brown in a 2010 special election after the death of Ted Kennedy.
Warren's journey from cloistered legal scholar to the kind of political superstar that threatened to eclipse Hillary Clinton's frontrunner status for the Democratic nomination is remarkable. But perhaps even more striking is her political evolution: Warren was once a Republican. It's not widely known that in the early 1990s, while she was still an academic, Warren was a registered voter with the GOP.