Among Independents: Romney 44%, Obama 43%

By Terence P. Jeffrey | September 18, 2012 | 2:33 PM EDT

Republican presidential candidate Mitt Romney boarding his campaign plain in Kansas City, Mo., on Sept. 16, 2012. (AP Photo/Charles Dharapak)

( - Republican presidential candidate Mitt Romney has taken a narrow lead over President Barack Obama among independent voters, according to Gallup polling data released Tuesday.

At the same time, Obama maintains a 47 percent to 46 percent lead among all registered voters in Gallup's latest seven-day tracking poll.

Among Democratic voters surveyed over the last three weeks, according to Gallup, Obama leads 92 percent to 5 percent. Among Republican voters, Romney leads Obama 92 percent to 5 percent.

But among independents, Romney leads 44 percent to 43 percent.

Each week, Gallup releases the demographic results for its presidential tracking poll for the previous three weeks. The current release reflects the three-week period from Aug. 27 to Sept. 16. During that time, Gallup surveyed 9,839 registered voters. Of these, 3,292 were Democrats, 3,290 were Republicans, and 3,010 were independents.

In the previous three-week period from Aug. 20-Sept. 9, Obama and Romney had been tied 43 percent to 43 percent among independents.

Since Gallup started releasing these demographic polling results on May 6, Obama has never exceeded 43 percent among independents. Romney, by contrast, has never exceeded 45 percent among independents—a peak he has hit twice (in the three-week periods that ended on July 22 and Aug. 5).

Gallup asked the registered voters it surveyed to rate the chance that they would actually go out and vote on a scale of 1 to 10. Those who rated their chance of voting a 10 were said to be “definitely” voting. In this three-week period, the percentage who said they were definite voters was highest among Republicans and lowest among independents. 88 percent of Republicans said they would definitely vote, 85 percent of Democrats, and 72 percent of Democrats, according to Gallup.

In the same three-week period, Obama expanded his lead among Catholic registered voters to 49 percent to 44 percent--up from 47 percent to 45 percent in the previous period. In the period that ended on Sept. 2, Romney had led Obama among Catholics, 47 percent to 45 percent.