Recent quotes:

Dynamic Scoring Considered Harmful: Focus - Washington Center for Equitable Growth

I had always thought that dynamic scoring was a bad idea because it leads to a ratchet–Democrats when they are in power claim deficit reduction from a stronger economy if their policies are enacted , and then Republicans when they are in power claim deficit reduction from a stronger economy if they undo what the Democrats did. You have no chance of getting policy-effect forecasts that are unbiased on average if you allow the party in power to shape CBO’s estimates of macroeconomic impacts. The vir clarissimus Robert Lynch has a good look at all the other issues in this can of worms: