President Barack Obama shakes hands following remarks at the Milwaukee Laborfest at Henry Maier Festival Park in Milwaukee, Wis. on Labor Day, Sept. 1, 2014.

President Barack Obama shakes hands following remarks at the Milwaukee Laborfest at Henry Maier Festival Park in Milwaukee, Wis. on Labor Day, Sept. 1, 2014.

President Barack Obama participates in an NBC Education Nation interview with Savannah Guthrie at the Milwaukee Theater in Milwaukee, Wis., Sept. 22, 2012.

President Barack Obama participates in an NBC Education Nation interview with Savannah Guthrie at the Milwaukee Theater in Milwaukee, Wis., Sept. 22, 2012.

First Lady Michelle Obama talks with community leaders at Oak Creek High School in Oak Creek, Wis., Aug. 23, 2012. The First Lady offered support for the victims of the attack at the gurdwara and to the community of Oak Creek. The First Lady talks with, from left, Kulwant Singh Dhaliwal, Secretary of Board of Trustees for the Sikh Temple; Oak Creek Mayor Steve Scaffidi; Rep. Gwen Moore, D-Wis.; Milwaukee Mayor Tom Barrett; County Executive Chris Abele, Milwaukee County; and Tonette Walker, Governor Scott Walker’s wife.

First Lady Michelle Obama talks with community leaders at Oak Creek High School in Oak Creek, Wis., Aug. 23, 2012. The First Lady offered support for the victims of the attack at the gurdwara and to the community of Oak Creek. The First Lady talks with, from left, Kulwant Singh Dhaliwal, Secretary of Board of Trustees for the Sikh Temple; Oak Creek Mayor Steve Scaffidi; Rep. Gwen Moore, D-Wis.; Milwaukee Mayor Tom Barrett; County Executive Chris Abele, Milwaukee County; and Tonette Walker, Governor Scott Walker's wife.

President Barack Obama tours Master Lock Company in Milwaukee, Wis., Feb. 15, 2012.

President Barack Obama tours Master Lock Company in Milwaukee, Wis., Feb. 15, 2012.

President Barack Obama arrives at General Mitchell International Airport for departure from Milwaukee, Wisconsin, Aug. 16, 2010.

President Barack Obama arrives at General Mitchell International Airport for departure from Milwaukee, Wisconsin, Aug. 16, 2010.

President Barack Obama meets backstage with from left: Political Director Patrick Gaspard, Wisconsin Gov. Jim Doyle and Sen. Herb Kohl at U.S.Cellular Arena in Milwaukee, Wisconsin, Aug. 16, 2010.

President Barack Obama meets backstage with from left: Political Director Patrick Gaspard, Wisconsin Gov. Jim Doyle and Sen. Herb Kohl at U.S.Cellular Arena in Milwaukee, Wisconsin, Aug. 16, 2010.

President Barack Obama greets people following his remarks on the economy at Racine Memorial Hall in Racine, Wisc., June 30, 2010.

President Barack Obama greets people following his remarks on the economy at Racine Memorial Hall in Racine, Wisc., June 30, 2010.

President Barack Obama delivers remarks during a town hall meeting on the economy at Racine Memorial Hall in Racine, Wisc., June 30, 2010.

President Barack Obama delivers remarks during a town hall meeting on the economy at Racine Memorial Hall in Racine, Wisc., June 30, 2010.