[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/28/art.obamapolls.gi.jpg caption="Obama speaks outside 10 Downing Street in London Saturday."]
(CNN) - Buoyed by a new Gallup daily tracking poll showing Barack Obama ahead by a 9-point margin, the latest CNN poll of polls suggests the Illinois senator has doubled his lead over John McCain.
Election Center: Check out the latest state and national polls
Obama now holds a 6-point lead in CNN's average of national polls, 45 percent to 39 percent, up from the 3-point margin over McCain the Democratic presidential candidate held at the end of last week. The increase is due to the wider spread Gallup is reporting - a poll that was conducted toward the end of Obama's highly covered trip abroad. The results suggest Obama's trip - which was extensively covered by the national and international media - may have given the Illinois senator a sizeable bump in the polls. By comparison, the Gallup daily tracking poll showed Obama only up by 3 points at the end of last week.
“There are early indications that Obama has received a boost from his trip to Europe and the Middle East,” said CNN Senior Political Researcher Alan Silverleib. “The key question, however, is whether or not Obama has eroded McCain’s advantage on the issues of national security and foreign policy. If McCain loses that edge, his road to victory in November will become much tougher.”
The latest Gallup poll also differs markedly from a Fox News poll released at the end of last week that showed the two presidential hopefuls only separated by 1 point - a sign of just how volatile national surveys are in the summer months with the majority of the American public yet to be focused on the race for the White House.
In addition to the Gallup poll and the Fox News poll, the CNN poll of polls also included a recent NBC/Wall Street Journal poll showing Obama with a 6-point advantage.