Ex-Rep. Carol Shea-Porter (D-N.H.) announced Thursday that she will seek her former seat in 2012.

Shea-Porter, an outspoken liberal who earned media attention for running unorthodox campaigns in the Granite State, lost to Rep. Frank Guinta (R) last November by a 12-point margin.

But in an email sent to her supporters and posted on her campaign website, Shea-Porter announced that she will run for the 1st district seat again.

“I am running for the United States House of Representatives,” Shea-Porter wrote. “During my two terms serving the good people of New Hampshire’s First District, I always worked for what I call the bottom 99% of Americans, and I never forgot that public office is a public trust.”

Shea-Porter was first elected to the House in 2006, when she unexpectedly defeated a Democrat backed by the national party in the primary, and then won the general election with 51 percent of the vote. The result was much to the surprise of many national Democratic operatives who closely watched her campaign. She narrowly won re-election with 52 percent in 2008, but she lost her seat to Guinta in the 2010 election cycle.

National Republican Congressional Committee spokesman Tory Mazzola mocked the announcement. “After compiling a partisan record that muscled through government-run healthcare and reckless tax-and-spend policies, New Hampshire voters know full well that sending Shea-Porter back to Washington will only result in skyrocketing debt on the backs of their children and a vote to try to put Nancy Pelosi back in the Speaker’s Chair,” he said.

Annie Kuster (D), who lost her 2010 race against Rep. Charles Bass (R) in New Hampshire’s 2nd district, also wants a rematch.

Shea-Porter is the second incumbent Democrat who lost last cycle to announce a bid for his or her former seat. The other Democrat is former Rep. Ann Kirkpatrick (Ariz.).