[..] The absence of these Democratic megadonors is contributing to a huge disparity in spending between pro-Republican and pro-Democratic groups. The groups wield huge influence in many House and Senate races because they can take in contributions of unlimited size.
In the last week, Republican-leaning groups outspent their Democratic counterparts on television by more than seven to one on Senate races and nearly four to one on House races across the country, according to data from the Campaign Media Analysis Group, which tracks political advertising. The gap shows few signs of abating, even with the midterm election season in full swing. [..]
Labor unions are still promising to spend large sums of money backing Democrats. But they are not keeping up at this point with the flood of money going to Republican-leaning organizations. The landmark Supreme Court ruling in the Citizens United case this year that eased restrictions on corporate political spending has certainly benefited Republicans, but so has the political environment. [..]