From New York Magazine:

“But as the Cook Political Report’s veteran Senate guru Jennifer Duffy notes, Democrats are off to a very good start, particularly on the fundraising front, in their effort to place as many GOP Senate seats into play as possible:

‘If there is anything that sticks out in Senate races this cycle, it’s the early spending on television advertising in the most competitive races. As of December 19, just over $32.5 million has been spent in eight key races. Democrats have outspent Republicans, $21.9 million to $10.6 million, according to data provided by [AdImpact].’ “

Read the full article here.