Not that I'm a political junkie, but what sort of cracked open my interest was starting to be able to decode the lies. Practically everything they (politicians, spokespeople, the media) say is a lie, and the interesting part is trying to figure out why they're saying it. What's the real motivation, who's paying whom, what ideology is being appealed to, what think tanks came up with the bogus statistics (or even the entire argument), what statements are bald-faced provable lies (that won't get caught in the 5-minute TV interview), and so on. And also things like important issues that media outlets ignore or blitz the public with in perfect syncronicity with each other.
I guess it's like liking (not that I do) the Jerry Springer Show (IDK if you all have that in the UK? It's a very trashy "freak-show" type of talk TV program.) It's all so filthy and rotten and low. People selling out any moral value to service their financial masters. The lies upon lies upon lies. Media people who play along and don't ask 'the wrong' questions so that people come back to them, and then they can become big shot "players," too.
It's the ultimate reality show. The only downside, of course, is that we have to live with the results.
As far as trickle-down/supply-side/radical-free-market economics, maybe consider that it isn't supposed to be understandable. That it's just a tool to make an argument, and that the intractability isn't an accident. If you use it, and someone disagrees, just quote 10,000 pages of abstruse crap generated by the Cato Institute. While your opponent burns brain cells trying to understand all that, you've in the mean time won the argument (or at least made your opponent feel too stupid to feel confident in arguing back). Sophistry wins.