EITHER THEY THINK GIULIANI'S WHOLE ACT IS A JOKE OR THEY THINK COLBERT'S ISN'T

Rasmussen Reports just did a poll testing the appeal of Stephen Colbert as a real third-party presidential candidate. Results of Colbert vs. the two front-runners:

Hillary Clinton (D) 45%
Rudy Giuliani (R) 35%
Stephen Colbert (I) 13%

Now here are results released October 12 from a Rasmussen poll pitting the two front-runners head to head:

Hillary Clinton (D) 48%
Rudy Giuliani (R) 41%

Hunh? With Colbert in the race, Giuliani's percentage goes down more than Clinton's? His goes down 6% while hers goes down only 3%?

Bizarre. The only explanation I have for this is in the post title. Any other ideas?