Prior to her election, Mossop was a well-known television news anchor and reporter in Hamilton, Ontario.

She also served as a news anchor for the Canadian Broadcasting Corporation, and wrote articles for the Hamilton Spectator.

Mossop is married to Dave Betts, a musician, currently with the Canadian rock band Honeymoon Suite.

The original Liberal candidate for Stoney Creek was Tony Magnini, who was not generally regarded as a credible match for the Progressive Conservative incumbent, Brad Clark.

Magnini was forced to resign after serious fraud allegations emerged in mid-campaign, however, and Mossop's last-minute candidacy reinvigorated the Liberal Party's organization in the riding.