Former Alaska governor and 2008 Republic Party vice-presidential nominee Sarah Palin has revealed that she may run for US President in 2012.

She said she would if she believed that that is the right thing to do for the country and for the Palin family.

"It would be absurd to not consider what it is that I can potentially do to help our country," Palin told Fox News Sunday in an interview recorded a few hours before she gave the keynote address at the National Tea Party Convention in Nashville.

"I won't close the door that perhaps could be open for me in the future," she added.

Palin, who has given her support to the National Tea Party by describing it as a viable political alternative to both the Republic Party and the Democratic Party, on Sunday declared the primacy of the Tenth Amendment in limiting government powers, complaining about the bailouts and the "generational theft" of rising deficits and urging the audience to back conservative challengers in contested primaries.

"America is ready for another revolution!" she told the crowd, prompting the first of several standing ovations.

Palin approved of President Obama's strengthening of the American military force in Afghanistan, but was dismissive of his decision to try some high-profile terrorism suspects in civilian courtrooms in the United States.

She called on Attorney General Eric H. Holder Jr., who formally made that decision, to resign.

Asked if she was more knowledgeable on domestic and foreign matters now than during her run in 2008 as the Republican vice-presidential candidate, she said: "I would hope so."

"Now that my focus has been enlarged, I sure as heck better be more astute on these current events, national issues," she added.

She left Nashville for Texas, where she spent part of Sunday on the stump with Gov. Rick Perry.