Mitt Romney has promised to create 12 million jobs in four years, but that is in line with what economists predict, regardless of who wins the White House:

Via:

"Most forecasts for employment growth are very close to 12 million over the next four years regardless of who wins the presidency," Mark Zandi, chief economist with Moody's Analytics, told The Hill.

Creating that many jobs in the next four years "is very doable," he said.
...

To get there, the economy would need to create, on average, 250,000 jobs a month beginning in 2013 and the nation could get back to near full employment, around 6 percent, and nearly a full recovery by mid-2016, Zandi and Hall said.

Even using the most conservative of estimates, the economists say that 4 million jobs could be created over the next four years in construction and construction-related industries like manufacturing, transportation, distribution and financial services.

However, the Labor Department has projected the creation of 20.5 million jobs between 2010 and 2020, with the health care industry showing the most growth.