HA! This is kinda funny. The Dems were backstabbing each other all over the place when it came to the 2008 election and the run-up to it. For instance, the Obama campaign kept Joe Biden out of the loop intentionally.
"The relationship between Barack Obama and Joe Biden grew so strained during the 2008 campaign, according to a new book, that the two rarely spoke and aides not only kept Biden off internal conference calls but refused to even tell him they existed."
Hillary supporters in Congress undermined her by channelling support through the endorsements of other Senators and Congressmen/Congresswomen.
"Sen. Majority Leader Harry Reid, Sen. Chuck Schumer (D-NY), and a group of other senators who would back Hillary Clinton’s candidacy encouraged Obama to run for the White House as early as 2006. The concern over Clinton was that she would be a weak Democratic standard-bearer while Obama could energize the party. In late summer 2007, Schumer – using an Obama ally, Sen. Claire McCaskill (D-MO), as a back channel – pushed the candidate to “take a two-by-four to Hillary,” as the authors put it."
Gets better...apparently Bill Clinton still hasn't managed to keep it in his pants...
"Members of what the authors call Clinton’s “war room within a war room” became convinced in 2006 that Bill Clinton was having a serious extramarital affair, prompting Hillary Clinton to instruct her aides to be prepared to combat the story."
...and Hillary thought Bill would be a distraction to Obama.
"Following the 2008 campaign, Hillary Clinton was shocked to have been offered the Secretary of State job and decided to reject the offer. She prepared a statement explaining why she would turn the new president down and remain in the Senate. But in an after-midnight call between Clinton and Obama, he persuaded her – only after Clinton expressed concerns about the problems posed by her husband, the former president."
Not to mention, Harry "The Weasel" Reid's revealing choice of words.
"Reid said Obama could fare well nationally as an African-American candidate because he was “light-skinned” and didn’t speak with a “Negro dialect unless he wanted to have one.” Saturday, the majority leader said he had used “poor choice of words” and called Obama to apologize; the White House issued a statement indicating that the president had forgiven Reid."
There are others incidents regarding the Democrats, and some with the Republicans (which really were due to the McCain camp not handling Sarah Palin well, and Palin being caught completely off-guard with the whole process due to their mishandling).