Believe that politicians are lying scum who will say anything to get votes? Turns out most of them follow through on what they say:

• Studies have consistently found that American Presidents have made a good faith effort to keep about two thirds of their campaign promises.
• Bush, after all, cut taxes and enacted education reform as he had promised. Obama delivered health care and environmental legislation.
• In fact, Obama so far has kept about 70% of his promises, while Republicans have kept about the same proportion of the promises they made before they took over the house.
• Over in Europe politicians keep even more of their promises, likely because in parliamentary systems the ruling party controls both the legislative and the executive branch.
• In cases where politicians don’t keep to their promises, it is often due to unusual circumstances – such as the once in a generation financial crisis that required Bush to pass a deficit inducing stimulus package.
• Perhaps politicians are thought of as liars because when they do abruptly go back on their word there is a lot of coverage around it, and people remember it more than instances of promises being kept.

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Source: Five Thirty Eight