What it says on the tin. With a POD after WW2, make one of the three Kennedy brothers a saint. Bonus points if one of the other Kennedy brothers becomes President. Mega-bonus points if the saint himself holds public office in the United States at some point in his life. I figure RFK is probably your best bet, since he seemed to be the most religious in OTL, but if you think it would be easier to go for one of the other two have fun.