The CBO will say anything the congressperson questioning him wants him to say.
Perhaps, but this time the CBO has done the modeling for the various proposals on the table.
In the near term (next two years), extending current tax law yields the biggest increase in GDP.
Over a longer term (10 years), the difference between extending currently law, and only extending it for families with income below $250,000 is approximately a wash.
This is from memory. There have been several articles and blog posts about it in the past couple of days.