HARRISBURG, Pa. (AP) - Pennsylvania Sen. Bob Casey is heading to New Hampshire to campaign for Hillary Clinton ahead of that state's first-in-the-nation primary on Tuesday.

A Casey campaign spokesman said Casey is driving to southern New Hampshire with his wife to lead three get-out-the-vote events Sunday with volunteers near Nashua.

It's Casey's first campaign event in New Hampshire.

Casey endorsed Clinton last April, although he sided with Barack Obama over Clinton in the hard-fought 2008 Democratic presidential primary.

Casey has served in the Senate with both Clinton and her primary opponent, Bernie Sanders of Vermont.

A Boston Globe/Suffolk University poll released Friday showed Sanders with a lead over Clinton in New Hampshire, though the two are running neck-and-neck nationally.