Most egregiously, he promised that he'd post for 3(?) days, every bill passed by Congress, prior to signing it into law. This is something that he could have done unilaterally, it was - and still is - entirely his own decision. Yet that promise was abandoned within the first week of his presidency.
That the promise was so quickly and thoroughly broken, even in cases for which there's no apparent special circumstances, is sufficient evidence to me that the promise was nothing but pandering, without any good faith behind it.
https://www.eff.org/deeplinks/2012/01/under-obama-administra...
I guess you can't expect that most of the words from a politician even made an impression as he orated them from the scroll/earpiece, less that they'll be remembered, less that they reflected any authentic intent or belief.