But even though political pundits like to take guesses and say what their gut is telling them, there's good statistical data to back up these predictions.
In 2008, Barack Obama won the popular vote with a total of 69,456,897 votes. John McCain received a total of 59,934,814. In case you cannot instantly do complex math in your head, Obama won 7.2% more total votes than McCain (52.9% versus 45.7%).
Obama wins by 7.2%, 7.6% of Americans see themselves as more of a Democrat than a Republican. Does the trend hold?
Well, in November of 2010, Republicans made huge gains in the House and some in the Senate. According to Rasmussen, in November of 2010, 36.0% of Americans saw themselves as Republicans and 34.7% as Democrats. That's a 1.3% advantage for Republicans.
Does that mean that Romney will win by almost 6%? Probably not. Does that show that it is extremely likely that Mr. Romney will win the popular vote? Yes.