"Deliberately sabotaging America's economy..."

What was that line that Mr. Kristof used?   About politicians threatening default, using a "potential catastrophe as a source of bargaining power in a game of extortion: We don’t want anything to happen to this fine American economy as we approach the debt limit, so you’d better meet our demand." That whole column, of course, was a plea for us to understand that this kind of tactic (known to normal people as "negotiation") is some beyond-the-pale behavior indulged in by Republicans and Republicans only.  Democrats would never play games with the debt limit.

So, here's a Senatorial example of "play[ing] politics with the debt limit":

Mr. President, I rise today to talk about America’s debt problem.  The fact that we are here today to debate raising America’s debt limit is a sign of leadership failure...

Increasing America’s debt weakens us domestically and internationally. Leadership means that "the buck stops here." Instead, Washington is shifting the burden of bad choices today onto the backs of our children and grandchildren. America has a debt problem and a failure of leadership. Americans deserve better.  I therefore intend to oppose the effort to increase America’s debt limit.

Which Senator was that who was "engaged in deliberately sabotaging America’s economy and damaging our national security"?

Senator Barack Obama, 3/16/2006.  He was arguing against raising the debt limit, and he was joined in voting against that raise of the limit by every single Democratic Senator.