|Note: recent events have lead to these topics being in the news quite often in recent weeks. However, Pond is not a reaction to those events - it was started nearly a year ago.
This is the interest on the bond, and the Fed sells these Treasurys to the public in order to raise money on an interim basis.
Effectively, it reflects the cost of borrowing money by the Federal Government of the United States to borrow money for ONE MONTH. This is a very short time period, as Treasurys are for sale in 1-mo to 30-year periods. So you'd only charge a high interest rate if you think the likelyhood of non-payment is actually an issue (that's risk vs. return).
Typically, 1 month is very not-risky, as it's highly likely that the US Gov is still around and solvent in a month. But with the recent debt ceiling / government shutdown rhetoric the market is beginning to get a little worried, so the premium the government must pay in order to borrow money has increased.
Basically by the Congress/White-House being deadlocked and having such fiery rhetoric it begins to appears as if there is a chance of default, and that chance is slightly higher than normal, so the risk/return on the 1 mo treasury has increased, as reflected in the increased interest rate the government has to pay to its bond holders.