Sen. Bernie Sanders waves to supporters as he arrives at Books-A-Million.

Kaylie Thompson, center, of South Portland, becomes emotional as she waits for Senator Bernie Sanders to make his entrance at a meet and greet promoting his new book, "Our Revolution."

Ashleigh Burgess shows off her brand new Bernie Sanders tattoo after meeting Sanders. Burgess, who said Sanders inspired her to go into teaching, said she was too nervous to show him her new ink.

Sanders speaks to supporters who waited in line for a chance to meet him and purchase his new book.

Fans of Sanders clap and cheer Monday after his brief speech.

Tim and Sam Paradis and their two children, Rylee, 2, and Emmett, 8 months, pose for a photo with Bernie Sanders. The couple says they brought their children with them because Sen. Sanders will hopefully be the person who will turn things around for their children's generation.

More than 500 people waited in line to get a chance to meet Sen. Bernie Sanders at Books-A-Million.

Jerri Benton, who came all the way to Maine from Florida, takes a photo with Sanders.

Lynne O'Connor hugs Jerri Benton after they exchanged books at the event. O'Connor gave Benton her signed copy of the book since Benton came all the way from Florida for the event and her copy wasn't signed.

Andrea Atwood of Cape Elizabeth gets her photo taken with Sanders during the meet and greet.