Unfortunately. People are either stupid or easily influenced. Part of it is probably the propaganda bombardment they get during and leading up to elections. Hell politicians don't even bother with that anymore, they campaign 100% of the time now.
I have a friend who I would consider otherwise intelligent, however I could not believe his political leanings. Basically voting against his best interests. Political parties also seem to tend to create these fictional realities that people buy into. Ideologies that they proport, but never really live up to. I think the big problem is, anyone that closely follows politics would easily see through the lies, however most are so disinterested in politics, so apathetic about their vote being more less meaningless, that most don't vote, and those that do don't really pay enough attention to even make an informed decision. Also there are social status that comes into play, voting for Conservatives/Republicans means you must be part of the wealthy elite (even though your really not).
Anyway I mean the guy in question is in a Union, and when I said that voting for Conservatives in Canada was counter to his best interests because they are anti-union he didn't believe me. His impression was that the Conservatives loved Unions and they had never ever done anything to Unions in the past. Some of the first things they did once elected were to break several Unions and force settlements, all under the guise of "for the sake of the economy" etc...
Anyway I know a few that are informed, and swing Conservative because they believe in certain factual things, which I can respect, however most seem to just spit ideology and rhetoric, most of which is meaningless as fed to them, and seem more than happy to vomit it up over anyone else close enough to listen.
Also not to generalize, but Old People. They tend to pay about as much attention (which is none), however are much more dangerous because most of them do vote. Most of them vote very consistently, and will proudly say that they have been Conservative for 30 years. Never mind that the Conservative party they are used to voting for has little resemblance to the one that exists today. They are not voting for someone, or something, but an idea of what they think a party is. Which is why in a rather cynical move the Conservatives apparently amended a bill recently to attempt to reduce the number of younger voters (as they more often than not do not vote Conservative). Anyway haven't really looked up the details for that one yet, but I wouldn't doubt it given their past machinations.