Romney predicts sky blue

Romney has been promising that if he's elected, the US will create 12 million jobs during his first term.  Sounds impressive, until one considers that 12 million jobs is about what one would expect regardless of who's President.

It's tempting to write this off as Romney trying to score some cheap points and maybe help his possible re-election chances if he "delivers" the expected result.  But Romney is depending on "faster economic growth" to make his tax plan work without raising taxes on the middle class.  If his predictions don't actually forecast faster job growth, how likely is it that growth will make up the shortfalls in his tax plan?