Massachusetts Democratic Senator Ed Markey and Republican challenger Kevin O'Connor debate for the only time Monday at 7 p.m. Listen live on WAMC or watch the debate here.
WATCH: Markey-O'Connnor Massachusetts Senate Debate
![Kevin O'Connor (left) and Senator Ed Markey (right) headshots made into a split composite photo.](https://npr.brightspotcdn.com/dims4/default/a474f10/2147483647/strip/true/crop/747x447+0+0/resize/880x527!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fwamc%2Ffiles%2F202010%2Fmarkey-o___connor_composite.png)
O'Connor photo provided, Markey photo credit WAMC.