Republican-leaning Super PACs and non-party political organizations have reported spending $40.8 million more on mid-term elections than those supporting Democrats, an analysis of Federal Election Commission data shows. 

Overall, there are 202 organizations spending money to influence the 2010 mid-terms, of which only 93 have disclosed their donors to the Federal Election Commission so far. Additional groups may disclose donors later this week, and some organizations known as 527 committees after the section of the tax code under which they are organized might disclose their donors to the Internal Revenue Service.

The top spenders are three party committees--the National ...