When the dust settles after November's midterm elections, candidates, parties, and outside groups will have spent almost $4 billion on the election, making 2014 by far the most expensive midterm campaign ever, according to the Center for Responsive Politics (CRP).
Republicans and conservative-leaning groups are expected to narrowly outpace their counterparts on the left, spending a projected $1.92 billion to the Democrats' and progressives' $1.76 billion. Combined with over $300 million in administrative costs on both sides, the final tally should be just under $4 billion.
The 2010 midterm election, for comparison's sake, cost approximately $3.6 billion.
This year, candidates and party committees will still make up the largest share of political spending, sinking about $2.7 billion into the election, according to CRP.
But in another sign of the dramatically increased influence of outside groups, almost $900 million in 2014 election spending will come from super PACs, tax-exempt 527 groups, and 501(c) nonprofit outfits. That projection, CRP noted, approaches the $1.3 billion spent by outside groups in 2012, when a presidential race drove up expenditures.
Many have credited the explosion in outside spending to the Supreme Court's 2010 decision in the Citizens United case, which dissolved some limits on political spending by corporations and unions.
While Democrats and progressive groups are expected to hold an edge in disclosed outside spending, that advantage should flip when so-called "dark money" is factored in. Under federal law, outside groups do not have to report money spent on certain kinds of ads as long as they aired more than two months before a general election or 30 days before a primary election. And conservative groups have far outpaced progressive groups in that type of spending: An estimated $100 million in spending has gone unreported, and, according to CRP, "that money leans distinctly to the right."
The one area in which Democrats should have a clear advantage is spending by the House and Senate party committees, the Democratic Congressional Campaign Committee and the Democratic Senatorial Campaign Committee. Those groups are expected to spend $427 million by Election Day, while their Republican counterparts are expected to only spend $330 million.
That advantage, though, should be more than offset when candidate spending is factored in: Republican congressional candidates are expected to spend $944.4 million, while Democrats are only expected to spend $718.8 million.
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