Political Punch has an interesting little collection of facts about candidate advertising. Among the most interesting:
* Mitt Romney was the No. 1 advertiser in both parties—35,000 ads—and spent as much as all of his GOP opponents combined—and almost four times as much as John McCain in Florida
* Barack Obama led the Democratic pack with almost 30,000 ads, worth almost $23 million; Hillary Clinton aired more than 25,500 ads, worth well over $18 million.
* Who did the talking? Barack Obama narrated nearly 83% of his own TV ads, while Hillary Clinton narrated fewer than half (43 percent) of hers.
* McCain used images of the American flag more than any other leading candidate, with 77% of his TV ads displaying the Stars and Stripes compared with 40% of Obama's and 33% of Clinton's.
Another interesting fact: Obama was the only candidate to air an ad during the Super Bowl. Take a look: