Many of Wisconsin Gov. Scott Walker's citizens may be signing petitions for his recall in reaction to the battle he led earlier in the year to weaken his state's public-employee unions.

But Walker doesn't appear to be backing off one inch from his stance that he did what was right for his state.

Mexico and the United States are working toward a broad package deal that would help revive the Colorado River Delta.  Laurel Morales reports for the Fronteras Changing America Desk.

Wisconsin Gov. Scott Walker is fighting back opponents who want him out of office. If organizers gather more than 500,000 signatures in 60 days, a new election will be held in 2012. Host Michel Martin speaks with Gov. Walker, who defends his record and criticizes the recall effort that began Tuesday.

The Sinaloa drug cartel sought military weapons to attack the US embassy in Mexico City and then blame it on a rival cartel. As Michel Marizco reports from the Fronteras Changing America Desk, the planned attacks were intended to send a message to the United States not to interfere in Mexico.

A new bipartisan study examines the latest Census data and finds that immigrants to the U.S., especially young immigrants, are assimilating well. Ruxandra Guidi reports from the Fronteras Changing America Desk.

Everything's big in Texas. Even health insurance mandates, it seems.

The Center for Public Integrity is out with a story about a Texas law that made it mandatory for health insurers to reimburse patients up to $200 for CT scans and ultrasound tests to look for heart trouble.

(New top to this post added at 2:20 p.m. ET)

The U.S. Secret Service just confirmed that Oscar Ramiro Ortega-Hernandez has been arrested in connection with the gunshots fired Friday night in Washington — one of which apparently hit a window at the White House.

In a statement sent to reporters, the agency says:

Though the U.S. economy faces lots of problems, as we said yesterday, there are some encouraging signs out there too.