Well, yes, that's basically the converse of the Principle of Charity (let's call it here the Principle of Political Doublespeak): in est, when a politician makes a promise, what they're actually promising is to temper all the decisions which
they themselves are presented with or hold sway over through that promise. For example, a promise to make the sky blue is really a promise on what color to paint the exteriors of all outgoing NASA satellite missions.
The only reason this is allowed is that everyone involved in the promise--the speaker and the lobbyists and the corporate executives and the military generals and the foreign policy analysts, and congress and the senate, too[1]--all share an understanding that all promises requiring certain attitudes from other parties the executive must work with--at least within a non-dictatorship--are empty, so no one is actually confused as to whether they will be fulfilled (they won't.) Thus, the stances behind them become a means of signalling, showing that one stands for the views of one's base even if one can do practically nothing "within the system" to advance the proposed agenda.
[1] Note that "the voters" aren't part of this list. This is one of the effects of truly representative democracy: there is no incentive for political language to be informative to anyone who doesn't have a say in "how the sausage is made."