Syllabic fidelity: 5. This is Obama's name, with an N sound at the beginning.
Relevance: 1. The N turns the first syllable of Obama's name into "no," indicating a rejection of the president. But what policy and why its being rejected is frustratingly unclear.
Elegance: 3. The pun is fairly easy to read.
Example of typical usage: At an Obama speech at Texas's Eastfield College, an anti-abortion protester held aloft a sign reading "Nobama Baby Murderer," according to an October 4, 2011 White House pool report. Example two: The sign at left, taken at a March 2010 rally, via Flickr's Fiobonacci Blue.
Syllabic fidelity: 3.5. The pun retains the O, B, and M sounds, and the -er is close to rhyming with -a.
Relevance: 2.5. Like Nobama, Obummer communicates a fairly general negative feeling. However, "bummer" connotes a general "meh" feeling, so the pun communicates the widespread feeling that Obama has let down those who were so excited by him in 2008.
Elegance: 4. Though the sound significantly diverges from the sound of the president's name, in print, it's easy to read, and you get the meaning instantly.
Example of typical usage: "Obummer, on the other hand, has spent the last couple months of his election and service as president to surgically remove all hope from the psyche of the American people with a chainsaw," wrote the blog Daily Anti-Kos on March 4, 2009. Example two: "Poor Obummer he put the curse on four great teams and they lost," scoffed Free Republic commenter ncfool on March 28, 2010, when Obama didn't pick the right teams to go to the NCAA Final Four.
Syllabic fidelity: 2. The pun retains the O, B, and M sounds, but the middle A is long instead of short.
Relevance: 5. The pun suggests a current Republican talking point, that Obama is blaming everyone else for the high unemployment rate and sluggish economy, instead of taking responsibility.
Elegance: 3.5. It takes a quick re-reading of the word the first time you see it to get that it's "O-blamer," and not "Oblahmer." But it's clear it's a reference to the president's name.
Example of typical usage: "Go back to stroking for Oblamer...it's what you do best," Atlantic Wire commenter Ex Speaker Nan said on a post about Mitt Romney's high school bullying on May 10.
Syllabic fidelity: 5. Perfect rhyme.
Relevance: 5. The pun speaks to the feeling that Obama has piled up massive debts that will be a crushing burden for the next generations.
Elegance: 1. It takes a close re-reading of this pun to figure out how it's supposed to sound. It looks like it's supposed to be pronounced "Aw-weh-bama." Perhaps a hyphen could help?
Example of typical usage: "More of owebama’s 'virtual' recovery," Free Republic commenter 43north said on March 13, 2012. Or, from gatoradams on Flickr, there's the above sign demanding we "Impeach Owebama."