I honestly don't think that any national newspaper would be so completely dim as to try and depict the first African American President as a monkey. That kind of thing is normally left to a certain brand of football 'fan', and perhaps daughters of former British Prime Ministers.
If the chimp had been drawn to look like Mr Obama, then perhaps the accusers would have a point.
Just a point on the monkey reference - it has always been used by racist as a term of abuse. When those fans made monkey noises at Sol Campbell, I'm pretty sure they weren't doing it from a sense of affection.