It's a consequence of the recession:
* The poverty rate in 2009 was the highest since 1994, but was 8.1 percentage points lower than the poverty rate in 1959, the first year for which poverty estimates are available. The number of people in poverty in 2009 is the largest number in the 51 years for which poverty estimates are available.
* In 2009, the family poverty rate and the number of families in poverty were 11.1 percent and 8.8 million, respectively, up from 10.3 percent and 8.1 million in 2008.
* The poverty rate and the number in poverty increased across all types of families: married-couple families (5.8 percent and 3.4 million in 2009 from 5.5 percent and 3.3 million in 2008); female-householder-with-no-husband-present families (29.9 percent and 4.4 million in 2009 from 28.7 percent and 4.2 million in 2008) and for male-householder-no-wife-present families (16.9 percent and 942,000 in 2009 from 13.8 percent and 723,000 in 2008).
The above link has much more information about individual incomes, household incomes and the number of Americans without health insurance. For even more information, go here (pdf)