JUNEAU, Alaska — Outgoing Alaska Gov. Sarah Palin on Saturday laid the groundwork to take on a larger, national role after leaving state government, citing a “higher calling” with the aim of uniting the country along conservative lines.

A day after surprising even her closest friends by announcing she would step down as Alaska governor on July 26, about a year and a half before her term was up, the Republican was still keeping details of her future plans under wrap. But in a statement posted on Palin’s Facebook account, she suggested that she had bigger plans and a national agenda she planned to push after she resigns at the end of the month.

“I am now looking ahead and how we can advance this country together with our values of less government intervention, greater energy independence, stronger national security, and much-needed fiscal restraint,” she said.

Palin also cast herself as a victim and blasted the media, calling the response to her announcement “predictable” and out of touch.

“How sad that Washington and the media will never understand; it’s about country,” the statement said. “And though it’s honorable for countless others to leave their positions for a higher calling and without finishing a term, of course we know by now, for some reason a different standard applies for the decisions I make.”

Palin’s personal spokeswoman, Meghan Stapleton, confirmed that the Facebook posting was written by the governor.

Her low-profile and vague Internet messages left mounting questions about her plans for the future shrouded in mystery. Will she lay the groundwork for a 2012 presidential bid? Will she find a high-profile place in the private sector, maybe on the speech circuit? Will she drop out of the limelight and focus on her five children?

Her constituents, for one, wanted to know, especially in Juneau, where she has struggled to win over residents.

“I think she owes it to Alaskans to tell us why,” said state Sen. Dennis Egan, D-Juneau, the son of Alaska’s first governor, Bill Egan.

Palin, whose popularity in Alaska has waned amid ongoing ethics investigations, gave many reasons for stepping down: She didn’t want to be a lame-duck governor; she was tired of the tasteless jokes aimed at her five children, including her son Trig, who has Down syndrome; she felt she could do more in another, still-to-be-defined role.

Sen. John McCain didn’t rule out a return to politics for his former running mate, saying Saturday he believes “she will continue to play an important leadership role in the Republican Party and our nation.” He gave no other details.