Biden's Iraq plan recieived overwhelming support in the Senate Wednesday.
HANOVER, New Hampshire (CNN) - On the same day a new CNN/WMUR poll shows Sen. John McCain gaining ground in the crucial state of New Hampshire, CNN has learned the Arizona Republican is set to hit Granite State airwaves with his first television ad of the 2008 presidential campaign season .
A source close to the Republican presidential hopeful tells CNN the television spot will go up in the early-voting state soon. The campaign is expected to reveal more details on the ad buy Thursday.
Once the clear frontrunner for the Republican presidential nomination, McCain found himself nearly broke last summer after his support for an immigration bill unpopular with the Republican base severely curbed his fundraising efforts.
But a CNN/WMUR poll released Wednesday indicates the 71-year-old four-term senator may be gaining ground in the state where he beat then-Texas Gov. George W. Bush in 2000. McCain registers 18 percent in the latest poll, an increase of 6 percentage points from July.
- CNN's Mark Preston and Alexander Mooney