I firmly agree with Jim Geraghty that Republicans must hammer Senator Barack Obama's voting record while in Congress and note that he is anything but a uniter.
In fact, according to the Washington Post vote database, Senator Obama voted with his party 96% of the time he was present. Compare that to John McCain's record of voting with his party 88% of the time.
The fact is, John McCain crossed the isle to work with "the other side" more than three times what the junior senator from Illinois did.
John McCain's "independence" and willingness to work with Democrats on so many subjects is precisely why a number of people within the Republican party loathed his candidacy in the first place. It is also why the media loved McCain during the Bush Presidency. They knew that he did not toe the party line - for what ever reason - and labeled him a "maveric."
Interestingly enough Senator Obama never really worked with Republicans either in Illinois or during his short tenure in the United States Senate and never recieved any such acolades. Instead he simply began spinning a narrative which caught fire due to the American public's frustration with the political environment which he helped foster.
The plain truth is if Americans are looking for someone who is willing to work with "the other side" then Senator McCain should be their candidate, not Barack Obama.