(image: 401k / flickr)

Thanks to gerrymandering and demographic sorting, many Congressional Republicans have far more to fear from a primary challenge than from a general election. In fact for a large number of Republicans, a primary challenge is their only electoral concern. The main political worry of these Republicans is the opinion of their primary voters and their big donors.

And while the bulk of the electorate thinks we should increase taxes on the rich, the Republican base is firmly against the idea. According to a new CNN poll, 56 percent of American adults think taxes on the rich should be kept high to pay for government programs. Among Republicans, though, 64 percent think taxes on the rich should be kept low to encourage investment.

I assume the situation is similar with big Republican donors. While there are a few Wall Street CEOs currently giving lip service to the idea of higher taxes on the rich to try to get a grand bargain that contains corporate tax reform, I suspect the vast majority of big Republicans really don’t want to see their taxes increase.

Given that most elected Republicans personally don’t support higher taxes on the rich, their based doesn’t support an increase and their donors don’t want to see their taxes go up, the Republicans in congress have basically no incentive to vote for a tax increase of any kind.