That is a silly argument. Bill clinton clearly had sexual relations with Monica. He confessed to it. There was his semen on a dress. She told us about it. He was claiming something didn't happen that clearly happened.
Perry told the truth. The Al Gore of 1988 was not known as the Al Gore of 2011. Perry should not be judged for his support of Al Gore in 1988 based on our views of Al Gore in 2011. To suggest that everybody in 1988 treated Al Gore like we do today is the falsehood.
Rush Limbaugh had a radio show by 1988, right? Did he regularly mock Al Gore for being an eco-nutcase? Were people making fun of Al Gore claiming to have invented the internet in 1988? Why don't you dig up that evidence, if you think Al Gore of 1988 was the same as Al Gore today.
You won't find it; we all know that Al Gore in 1988 was seen differently than he is today, that is what Perry was saying, and it was the truth.
Here’s Al Gore in 1983 when he was still a Congressman, laying out the case that we’re all DOOOOOOOOOOOOOOMED from global warming and climate change:
http://www.youtube.com/watch?v=T8JlBkOe6HU&feature=related