Mark Memmott

(New material based on NPR reporting added to the top of this post at 12:30 p.m. ET.)

Republican presidential candidate Herman Cain is reassessing his campaign but still plans to move ahead at this time, his Iowa campaign director tells The Associated Press and NPR.

American Airlines, one of the giants of the U.S. airline industry, just announced it is filing for Chapter 11 bankruptcy protection.

The U.S.-NATO mission in Libya was a "recipe for success in the future," President Obama said Tuesday on NBC-TV's The Tonight Show with Jay Leno.

During a sober discussion that lasted several minutes, the president told Leno that he doesn't agree with critics who say the U.S. led from behind.

From Alabama and Georgia north to the border with Canada, there are reports from all over the continental U.S. today about a fantastic show last night:

An intense geomagnetic storm that produced some of the best "Northern Lights" in recent memory, reports SpaceWeather.com.

Many folks are posting photos and videos. Here's one that the poster says was taken in Michigan.

Saying that it "reorders the way they do business in Washington by reinventing the tax code and restoring our nation to fiscal health through balanced budgets and entitlement reform," Texas Gov. Rick Perry is this hour unveiling his "cut, balance and grow plan" on taxes.

Michele Norris, an All Things Considered co-host since December 2002, is stepping away from that post until after the 2012 presidential campaign because her husband has taken a senior position with President Obama's re-election effort.

She is not leaving NPR's airwaves, however. While she will not be involved in coverage of the 2012 election, Norris will continue to report and produce projects for the organization.

In a message just sent to NPR staff, Norris says:

Update at 5:42 p.m. ET. As expected, President Obama announced that his administration was easing the terms of a federal program that would open the doors for homeowners to refinancing their homes no matter how far underwater their mortgage is.

The AP reports that the Federal Housing Finance Administration "estimated an additional 1 million people would qualify. Moody's Analytics say the figure could be as high as 1.6 million."

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