Eisenhower could talk in circles in a way that left me, as a little kid, wondering what the hell he said and being favorably impressed at the same time. JFK would get this little smile and say "Let me say this about that,..." and off he go, making sentance after sentance that told you ZERO, but without stammer one. They were the masters, you knew it was pure golden BS, but it was fun to listen to and they were, in completely different ways, great men.
Since, we've mostly had (except Reagan) story tellers who were simply unbelieveable. Why ANYONE believed a word Clinton said, for example, was completely beyond me.
But Obama's the WORST in my living memory. He just outright LIES, and is bad at it. A reporter will have a tape of yesterdays pronouncment, opposite todays, and Obama will say they are the same, then ramble disjointedly and pretend he proved his point. He's either completely and utterly delusional or he is not as "smart" as his worshipers say, indeed, he's a stupid man.