She kicked off her East Coast bus tour to visit historic sites in Washington D.C. Sunday by riding on the back of a Harley. Palin and family members jumped on bikes and joined thousands of other motorcyclists on the Memorial Day weekend ride from the Pentagon to the Vietnam Veterans Memorial.
On the windshield of Palin's bike was a likeness of President George W. Bush. Next to it, the words "Miss Me?" And on her hand, the words "justice rolls" were written in smeared ink.
It was an apparent reference to Martin Luther King Jr.'s "I Have a Dream" speech, which is quoted on Palin's website: "We will not be satisfied until justice rolls down like waters and righteousness like a mighty stream."
Details about where the bus is scheduled to stop haven't been released. Aids pointed to the website of Palin's political action committee, which is prominently collecting donations ahead of the end-of-June fundraising quarter.
The former Alaska governor has deflected any questions relating to her possible run for the Republican presidential nomination.
Palin has a loyal following among conservatives and tea-party activists, but she remains a divisive figure among the wider public. Polls show more people have an unfavorable opinion of her than not.
The Associated Press contributed to this story