Colby College graduates throw their mortarboards in the air following commencement in Waterville on Sunday.

Colby College President David Greene confers an honorary degree of Doctor of Letters on commencement speaker Arianna Huffington, co-founder of the Huffington Post, on Sunday.

Colby College senior class speaker Brendan Leonard gestures during his address to fellow graduates at the college commencement in Waterville on Sunday. At right is college president David Greene.

Colby College senior Emma Wood, right, is congratulated by friend Mave Dolan during commencement in Waterville on Sunday.

Colby College graduates applaud fellow classmates receiving their diplomas during commencement in Waterville on Sunday.

Arianna Huffington, co-founder of the Huffington Post, is seen on a large screen during commencement at Colby College in Waterville on Sunday. Huffington was the commencement speaker.

Colby College senior Kate Riley, right, hugs friend Elizabeth Paulino during the procession for commencement in Waterville on Sunday.

Arianna Huffington, co-founder, president and editor-in-chief of the Huffington Post, walks with Colby College President David Greene during the commencement procession at the Waterville campus on Sunday.

Huffington Post co-founder Arianna Huffington gave the commencement address during the Colby College commencement on Sunday.