The question of the Bush Tax cuts 'causing' the deficits, and hence the 'need' to increase taxes on the 'wealthy' is one which Democrats spend many evenings discussing. Clearly, Bush was an insane tax-cutter without any good ideas and caused every problem mankind faces today, and frankly every problem we've faced for the last 40 years. He was just that bad.
However, a non-partisan look at the cuts indicates something quite different. On a standalone basis, taking out all other additional spending programs from the last 11 years, what we find is the tax cuts paid for themselves, and then some. In other words, the issue isn't the cuts. The issue is all the additional spending which took place after the cuts. To be completely honest, and completely fair, not all the spending was by Bush, either. In fact, most of it was voted on with bipartisan support. Very little could be said to be purely Bush-related, let alone Republican-related.
Honesty is a difficult thing in politics. Typically I don't look for anything more than a minimal degree of it, what I prefer is a level of consistency of thought. The Republicans have their own challenges regarding honesty and consistency, but the Democrats have really done a good job of cornering the market on dishonesty and hypocrisy.