17. Charles Schwab, the founder of the eponymous brokerage firm, and his wife Helen gave $8,531,440 to Republicans.

Total donations: $8,531,440

Party Affiliation: Republican

Net worth: $8.2 billion

Charles Schwab, 81, founded his brokerage firm in 1971 and served as its CEO until 2008, according to Forbes. Schwab's fortune comes from his 11% stake in the firm.

Helen is a philanthropist and serves as the president of the board of the Charles and Helen Schwab Foundation, according to the organization's website.

The couple resides in Woodside, California and has 5 children, according to Forbes.