By ABBY PHILLIP, Politico
Outside group spending on political ads is up 1,600 percent in the Republican primary, compared to this point in the 2008 race, new research shows.
The surge in spending is in large part because of the rise of super PACs, the study from the Wesleyan Media Project found.
Nearly half of the ads on the airwaves were paid for by super PACs this cycle, while ads sponsored by candidates are down 40 percent. In all, the volume of ads aired has increased slightly, 2 percent, over the last cycle. [READ MORE]