Romney concedes, thanks supporters

Republican presidential candidate Mitt Romney, wife, Ann Romney, wave to the crowd on stage after conceding the presidency during Mitt Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts. President Barack Obama won re-election against Romney, after voters went to the polls in the heavily contested presidential race.

Spectators react to President Obama's projected re-election displayed on large televisions during Mitt Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

A spectator sits on a bench on his Apple iPhone while waiting for Republican presidential candidate Mitt Romney, to concede his presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney is greeted by wife, Ann Romney, Republican vice presidential candidate, Rep. Paul Ryan (R-WI), and wife, Janna Ryan after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney waves to the crowd while speaking at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

A woman reacts to a speech by Republican presidential candidate Mitt Romney, while he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney speaks at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Spectators sit on the floor as they wait for Republican presidential candidate Mitt Romney to concede his presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

(L-R) Republican presidential candidate Mitt Romney, wife, Ann Romney, Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI), wife, Janna Ryan, and family walk off of the stage after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Spectators react to a speech by Republican presidential candidate Mitt Romney, while he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney waves to the crowd while speaking at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney waves to the crowd while speaking at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney speaks at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate, Mitt Romney, wife, Ann Romney, wave to the crowd on stage after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

(L-R) Republican presidential candidate Mitt Romney greets Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI) on stage while his wife, Ann Romney, and Janna Ryan hug after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center

(L-R) Republican presidential candidate Mitt Romney, wife, Ann Romney, Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI), and wife, Janna Ryan, stand on stage together after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney, wife, Ann Romney, Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI), wife, Janna Ryan, and their families greet each other on stage after conceding the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney speaks at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI) and family wave to the crowd after Republican presidential candidate Mitt Romney conceded the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.

Republican presidential candidate Mitt Romney speaks at the podium as he concedes the presidency during Romney's campaign election night event at the Boston Convention & Exhibition Center on Nov. 7, 2012, in Massachusetts.