ABC News' Matthew Jaffe reports:
In an effort to boost his struggling campaign ahead of the Ames straw poll on Aug. 13, Tim Pawlenty has reserved around $200,000 of TV advertising in the Des Moines media market starting Monday and running through the straw poll, a source familiar with the ad buy told ABC News.
On Monday, Pawlenty starts a five-day RV swing through the Hawkeye State. The new ad purchase by the former Minnesota governor -- who has a lot riding on Ames -- is the biggest to date in the 2012 race. He had previously run TV ads in Iowa and this week launched a radio ad touting a video about his faith.
Earlier Friday, Pawlenty revealed that his campaign had raised a total of $4.45 million during the second quarter and entered the crucial upcoming stretch with $1.4 million cash on hand for the GOP primary.