It's well-known that the Democratic presidential hopefuls brought in vastly more campaign cash than their Republican contenders.
Now here comes the latest study showing how they're vastly outspending them, too.
Democratic candidates have spent nearly $135 million on campaign advertising, compared to about $58 million for Republicans, according to the Wisconsin Advertising Project's analysis of data from TNS Media Intelligence/CMAG.
Barack Obama has spent approximately $75 million on TV and other ads, more than the total amount spent by the entire Republican field, while Hillary Clinton has spent more than $46 million, the analysis found.
The study also highlighted the benefits of ad spending, while buttressing the Clinton campaign's argument that she has been winning more of the recent primaries while being outspent dramatically by Obama
In states with nominating contests through Super Tuesday on Feb. 5, the Clinton and Obama campaigns were about equal in the amount of spending on television advertising. In states with primaries from Feb. 9-19 -- when Obama won nine straight contests and won 119 more delegates than Clinton -- he out-advertised Clinton by a ratio of over 3 to 1.
"Fundamental factors matter most in elections and advertising is likely to have fairly modest effects at the margin,กจ Ken Goldstein, director of the Wisconsin Advertising Project, said in a statement. "That said, unbalanced flows of paid information in a generally positive free media environment have the greatest potential to move numbers and influence races. This was the environment between February 5 and February 19 and that is what won Barack Obama the Democratic nomination."
In states with primaries after Feb. 19, the Obama campaign has spent twice as much on campaign advertising as the Clinton campaign, but she has won more of those contests.
On the Republican side, Mitt Romney was the top ad spender, with nearly $32 million, but still lost the nomination to John McCain, who spent about $11 million.
About Political Intelligence
Glen Johnson is Politics Editor at boston.com and lead blogger for "Political Intelligence." He moved to Massachusetts in the fourth grade, and has covered local, state, and national politics for over 25 years. E-mail him at firstname.lastname@example.org. Follow him on Twitter @globeglen.