(CNSNews.com) - President Barack Obama widened his lead over Republican candidate Mitt Romney to 49 percent to 45 percent in the seven-day period in the Gallup tracking poll that ended on Sept. 7.

In the seven-day period that ended on Sept. 6, Obama had led Romney 48 percent to 45 percent.

Back on Monday, Aug. 27, the day before the Republican National Convention started in Tampa, Fla., Romney had led Obama in the Gallup tracking poll 46 percent to 47 percent. But, according to Gallup's poll, Romney actually lost ground slightly during the Republican convention, ending up down by Obama 47 percent to 46 percent this Monday, the day before the Democratic National Convention started in Charlotte, N.C.

Obama's support had not gone as high as 49 percent in the Gallup tracking poll at any time after April 26, when he had led Romney 50 percent to 43 percent. Romney's support has never reached 49 percent in the Gallup tracking poll. According to the poll, Romney's support peaked at 48 percent, a level it sustained from April 16-18, but has reached again since.

Gallup started publishing its tracking poll results for this presidential race as of April 15.

Gallup's poll is based on interviewing about 3,050 registered voters over the course of seven days. It has a margin of error of +/- 2 percentage points.