More than 355,000 Americans have pledged money to Organizing for Action from January to September -- totaling more than $21 million.

The average donation was around $59, but 19 individuals each raised $100,000 or more, for more than $3.3 million combined, Alex Rogers of reported Monday.

The two biggest donors sent in $500,000 each: Fred Eychaner, chief executive officer of Newsweb Corp.; and David Shaw, founder of hedge fund D.E. Shaw & Co.

According to OpenSecrets, Eychaner gave $43.5 million to Priorities USA in 2012, almost $4 million to Majority PAC, $3.75 million to House Majority PAC and $750,000 for Women Vote!.

Success has allowed Shaw's company to be a top researcher in the field of computational biochemistry while simultaneously promoting Democratic causes. Shaw, who is worth $3.5 billion according to Forbes, has given out about $500,000 to OFA with the help of his wife.

Amy Goldman Fowler, real estate heiress; Phil Munger, philanthropist; and Judith and Bill Scheide, philanthropists, all donated $250,000 each to OFA as well.

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