On the site, I'm not sure...
There's this TL Series I made,
Kings of Camelot, in which Joe Kennedy Jr doesn't die in WWII and thus becomes the first Kennedy President in 1965...so its about US Politics
Off site, there's OTL.com's
Kennedy Runs Later series, in which basically JFK and Humphrey switch places, with Kennedy winning the 1968 election and chaos ensuing...it's a pretty decent read...
Oh, and of course, the two "Dewey beats Truman" TLs for the Timeline contest, the "53 states TL" and "For want of a newsreel"