from factcheck.org:
We found a few factual issues in Tuesday night's big-name speeches at the convention in Minnesota's Twin Cities.
Obama on Your Side
Sen. Joe Lieberman, the former Democrat (now Independent) who supports McCain, accused Obama of not reaching out to the other side:
Lieberman: In the Senate, during the three-and-a-half years that Senator Obama has been a member, he has not reached across party lines to get accomplish anything significant. ...
We don't know what Lieberman considers "significant." But Obama has co-sponsored bills with members of the other party, some of which have been noteworthy. Obama and Republican Sen. Richard Lugar of Indiana, for instance, teamed up on an initiative to lock down and secure both nuclear and conventional weapons worldwide, such as the shoulder-fired, anti-aircraft missiles that have been proliferating in recent years. According to a report on the bill by the Senate Foreign Relations Committee, the legislation "enhances: (1) U.S. cooperation with foreign governments to destroy conventional weapons stockpiles around the world; and (2) the United States' ability to provide assistance to foreign governments aimed at helping them detect and interdict weapons and materials of mass destruction." Lugar hasn't objected to Obama's characterization of their partnership or the bill, which became law in 2007, in his ads.
Another example: Obama worked with Sen. Tom Coburn, an Oklahoma Republican, to write the Federal Funding Accountability and Transparency Act of 2006, which created a searchable database the public can use to look up details on federal grants and contracts. (McCain was also among the original co-sponsors of that bill, so Lieberman may have been tarring his own candidate when he disparaged Obama's legislative accomplishments). Obama and Coburn also got together on a bill to prohibit the Department of Homeland Security from issuing open-ended, no-bid contracts for emergency response activities after abuses were found in post-Katrina contracting.