Tuesday's elections harbinger of midterms?

Chairman Tom Perez is the Chairman of the Democratic National Committee since February 2017. Chairman Perez was the United States Secretary of Labor from 2013 to 2017. In March 2013, he was nominated by President Barack Obama to be the United States Secretary of Labor, replacing outgoing Secretary Hilda Solis. He was confirmed by the Senate on July 18 and sworn in on July 23, 2013. Prior to that he worked as a consumer advocate and civil rights lawyer before serving as the Assistant Attorney General for Civil Rights from 2009 to 2013. He worked as a law clerk for the U.S. District Court for the District of Colorado before serving in the Department of Justice from 1989 to 1995, where he worked as a federal prosecutor, and as Deputy Assistant Attorney General for Civil Rights under Attorney General Janet Reno. He worked as a Special Counselor for Senator Ted Kennedy until 1998 when he served as the Director of the Office for Civil Rights at the U.S. Department of Health and Human Services in the final years of the Clinton administration.