According to research by the Center for Media and Public Affairs at George Mason University, Jay Leno, David Letterman, Jon Stewart and Jimmy Fallon joked about Obama a total of 309 times compared to Sarah Palin, at 137.
On a more serious note you can read their research on media coverage of the elections on the CPMA website. This has an Obama Watch website which has been monitoring coverage since the start of Obama's presidency.
Other sources of discussion about the role of the media during the campaigns include:
The Wesleyan Media Project which is a collaboration among Professors Erika Franklin Fowler (Wesleyan University), Michael M. Franz (Bowdoin College) and Travis N. Ridout (Washington State University).It is tracking political advertising in elections.
Media week- designed for the profession it has also been considering campaign advertising, among other topics.
The Columbia Journalism review has a team following the campaigns. Read their insights online from the website.
The Pew Research Center for Excellence in Journalism has a weekly news coverage index.
In a related site, the Pew Research Center for the People and the Presshas a regular news interest index which maps popular topics. According to last week's review the American public are more interested in the economy, than the elections!
Mediagazer - is aggregating key topics in the media and is particularly good at highlighting the use of social media. There are currently some good links to stories about Twitter, web 2.0 and the elections.
The National Journal has also been discussing the use of social media during the campaigns. View a view video discussion on their website
Finally if you were really looking for jokes about the elections. See the Onion's quick guide