Mitt Romney leads President Barack Obama among middle-income voters, according to a new Gallup poll. Romney leads Obama 49 percent to 45 percent among voters whose household income falls between $36,000 and $89,999. According to Gallup:
Obama's lead over Romney among low-income voters has ranged between 13 and 16 percentage points in each of the three-week rolling averages of the vote by demographic group that Gallup has reported since late April. Meanwhile, Romney's edge among middle-income voters has been between four and seven points, and among upper-income voters, between four and six points. …
Though Romney's edge among middle-income voters is similar to his lead among upper-income voters, in certain subgroups of middle-income voters he performs especially well. That includes middle-income independent voters, who right now prefer Romney by an eight-point margin, 48% to 40%. Obama leads among lower-income independents, and the two are tied among upper-income independents.