(CNN) - Barack Obama holds leads in critical battleground states of Iowa and Pennsylvania with only six weeks remaining until Election Day, according to just released CNN poll of polls.
New surveys also released Monday suggest Obama and John McCain are locked in statistical ties in two other crucial swing states.
According to CNN's Iowa poll of polls, Obama holds a 7-point lead (50-43 percent) in the state that narrowly voted for President Bush in 2004 and gave a major boost to Obama's presidential fortunes earlier this year at the start of the primary season.
A poll of polls out of Pennsylvania shows the race there considerably tighter, with the Illinois senator - who lost handily to Hillary Clinton in the Democratic primary there - holding a slim 3 point lead over McCain (47-44 percent).
Both the Iowa and Pennsylvania poll of polls consist of three recent surveys out of both states, and neither carries a margin of error.
In Minnesota, the site of the Republican convention earlier this month, a new American Research Group poll suggests the race there has tightened considerably, with Obama holding a 1-point lead (46-45 percent) that is well within the survey's 4 percent sampling error.
A new Suffolk University poll out of Nevada also suggests the race there is a dead heat, with McCain holding a 1-point lead (48-47 percent) that is again well within the poll's sampling error.
CNN considers both Iowa and Pennsylvania as "leaning Obama" in its electoral map breakdown ,while Minnesota and Nevada are considered tossup states.