Talk about the candidates' quest dragging on... In 1968, as I remember well, it went on a good deal longer than it has so far in 2008. 1968 was another election year when the incumbent president did not run for reelection and the scramble for votes was an active one, leaving a lot of acrimony in the air. Had Kennedy not died midway, I think it would have brcome even more vicious.

"Kennedy was still in second place in the race for the candidacy with 393 delegates compared to the leader Hubert Humphrey who had 561." Wikipedia

And this was in early June.