Cars run past a board showing support for U.S. President Barack Obama in Colebrook, New Hampshire, Nov. 5, 2012. The Americans will go to voting stations for the U.S. presidential election on Nov. 6, 2012. [Xinhua]

Pro-Romney poster and American national flag are seen at a local resident's house in Colebrook, New Hampshire, Nov. 5, 2012. The Americans will go to voting stations for the U.S. presidential election on Nov. 6, 2012. [Xinhua]

A working staff locks the ballot box during the preparation for the voting at a polling station in Dixville Notch, New Hampshire, the United States, Nov. 5, 2012. Ten registered voters are expected to cast their ballots at the stroke of midnight on Tuesday Nov. 6, in Dixville Notch, signifying the official beginning of the voting in the 2012 U.S. presidential elections. [Xinhua]

A working staff puts the ballot box on a table during the preparation for the voting at a polling station in Dixville Notch, New Hampshire, the United States, Nov. 5, 2012. Ten registered voters are expected to cast their ballots at the stroke of midnight on Tuesday Nov. 6, in Dixville Notch, signifying the official beginning of the voting in the 2012 U.S. presidential elections. [Xinhua]

Photo taken on Nov. 5, 2012 shows a polling station in Dixville Notch, New Hampshire, the United States. Ten registered voters are expected to cast their ballots at the stroke of midnight on Tuesday Nov. 6, in Dixville Notch, signifying the official beginning of the voting in the 2012 U.S. presidential elections. [Xinhua]

Photo taken on Nov. 5, 2012 shows a polling station in Dixville Notch, New Hampshire, the United States. Ten registered voters are expected to cast their ballots at the stroke of midnight on Tuesday Nov. 6, in Dixville Notch, signifying the official beginning of the voting in the 2012 U.S. presidential elections. [Xinhua]