I am also related to George Bush through a common ancestor in the Mass. Bay Colony. So what? I think something like 1/3 of Americans can find a common ancestor with the Bush family. But since we are cousins, I will vote for W.
Have you tried a google search on Rev. John Lathrop, who arrived in the Bay Colony in 1634? His descendants run the range from politicians (Romney, Bush, Roosevelt) to generals (Benedict Arnold, U.S. Grant) to religious leaders (Rev. John Witherspoon, Mormon prophet Joseph Smith). I wouldn't be surprised if Kerry is related somehow, probably through the Benedict Arnold line. Al Gore, I beleive was a distant cousin of Aaron Burr.