Campaign finance data may help answer that question.
"Sen. Jim Webb's campaign-finance report for the last quarter of 2010 is raising questions about whether the Virginia Democrat will seek another term next year.
Webb reported that he raised $12,000 from October through December 2010, finishing the year with $440,000 in his bank account.
The first-term senator is viewed by non-partisan political analyst Charlie Cook and others to be among the most vulnerable senators in either party who is up for re-election in 2012. Republicans George Allen, who was defeated by Webb in 2006, and Jamie Radtke, a Virginia Tea Party leader, have announced they intend to run."
USA Today has this report.