One of the most unprecedented and unpredictable presidential campaigns ever is about to come to an end. The first polling places will begin closing in less than 24 hours from now. Kamala Harris and Donald Trump are making a last minute push for every undecided voter with dueling rallies in the all important battleground state of Pennsylvania. CNN journalists are covering the final hours of this historic contest.  Learn more about your ad choices. Visit podcastchoices.com/adchoices