it isn't just the trump campaign being pounded on the air waves financially. democrats are outspending the republicans almost two to one. the team at the nbc political unit, we crunched the numbers. democratic senate campaigns spent more than $135 million in advertising through the end of september including al gross ending on the democratic line in alaska. that's nearly twice of what republicans spend. that spending advantage is smaller when you account for outside groups. democrats spend $345 million compared to $288 million by republicans. the democrat's advantage is clear in iowa. greenfield used $29 million in iowa.