Television advertising for Democratic presidential candidates Hillary Rodham Clinton and Barack Obama cost about $8 million in Ohio leading up to the hotly contested March 4 primary.
Obama, who lost to Clinton in Ohio for the first time in 11 consecutive contests, outspent Clinton by nearly two to one and also benefited from $1 million in special ads bought by two labor unions.
Data compiled by the University of Wisconsin Advertising Project also suggests that Clinton shifted political strategy for Ohio after Obama defeated her in Wisconsin on Feb. 19.