U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

U.S. President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's U.S. Presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for U.S. President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)

President Obama Continues His Push Through Key Swing States In Final Days Before Election

MILWAUKEE, WI - NOVEMBER 03: Pop artist Katy Perry performs at a campaign rally for President Barack Obama at the Delta Center on November 3, 2012 in Milwaukee, Wisconsin. Wisconsin is one of nine battleground states expected to determine the outcome of Tuesday's presidential election. (Photo by Scott Olson/Getty Images)