it might be easier to follow his "logic" if he ever bothered to explain himself

Beck says ‘progressives’ share ideological kinship with ‘tyrants’ and ‘slave owners.’
(Think Progress)
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It still amazes me that the repugs and conservatives have the imagination to come up with these non-sequitur styled comparisons. Of course, they don't bother to explain, so I guess it is simply a game of saying "progressives/liberals are like..." and throwing in some word that people don't like. It doesn't matter if it doesn't make sense or have any reasoning behind it - it's all just sound bytes.