Of course economics trumps politics. Economics determines the way that politicians go about doing their job and the way people look at politicians. Economics definitely has more influence on politics than politics has on it. It has always been this way and I do not think there is anything people can do to change it.
This is not a question that really lends itself to a yes or no answer because economics is what runs the world and politics is one of the voices it has. Differing economic stands get voiced through different political parties. But politics at least pretends that there are other issues at stake, without admitting that the world is driven by money concerns alone. So, economics does trump politics by being the hidden card that controls everything.
Politics is essentially a short term game. The can can be kicked down the road but not indefinitely. It gets crushed and flattened and harder to kick and economics overstrides the battered can. There may be short term political advantage in deferring the inevitable to seek alternatives or prepare the audience but the long term weight of economic imperatives eventually tell. Inflation may lighten debt but the levels required to eliminate are themselves politically ruinous. There is no such thing as a free lunch. The bill gets picked up by someone, somewhere, some time.
A politician's first job is to get themselves reelected and they are going to do whatever it takes to make sure this happens. They will listen to the special interests, they will make sure they vote with whatever the experts in their party tell them to do. If economics really trumped, I dont think some of the problems we have now would exist.
To say economics trumps politics is like saying the frame of the car trumps the engine. Economics is synonymous with politics. One does not exist with out the other. For instance, there is a current political argument about the deficit and fiscal state of America, one political party appears to have a perception of how to address it, while the other political party appears to have a different way to deal with it. Either way, logical deduction would say the economy will fall the way of whom ever appears to have the most power.
1) Politics is about getting votes and staying in power.
Economics in one sense is about getting the most out of what we have.
2) The first insight of economics is that "People respond to incentives." Politicians too are people and therefore they too would do what's in their best interest. But to also sympathise with them, whats in 'public-interest' beyond the essentials like protection of property rights and defending the country is impossible to determine in a world where heterogenety is so wide-spread.
3) The modern economy is such a complex organism that nobody can grasp it fully. The citizens in the face of chronic depriviation are extremely docile and ignorant and desperate for aid. Government gives them hope. Politicians too, make promises for giving what people (their clients) ask for. Can a business tell their clients that they are wrong?
4) Read "Public Choice" for more insights.