It almost double what was spent in 2004 election cycle . Lower TV advertising costs help more candidates advertise . Mitt Romney leads presidential candidates in TV spending . Democrats face costs of advertising through clutter of ads , analyst said .
Amount almost double what was spent in 2004 election cycle . Lower TV production costs help more candidates advertise . Mitt Romney leads presidential candidates in TV spending . Advertisers face challenge of cutting through clutter of ads , analyst says .