The Democratic Congressional Campaign Committee (DCCC) recorded its best fundraising and largest advertising cycle during the 2014 midterms.

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The House Democrats' fundraising arm boasted $172 million in fundraising this election, its best cycle ever, reaching $110 million in grassroots funding with 95 percent of gifts being $50 or less. That compares to the National Republican Congressional Committee's $131 million this cycle.

Gifters made repeat donations to the DCCC, with 1.5 million low-dollar donors chipping in on more than four million contributions, the House Democrats' campaign arm boasted in a Monday memo. 

The committee, whose chairman has said 20 House districts could go "either way" on Tuesday, recorded its largest total ad buy this cycle. It quadrupled its digital advertising to reach upwards of 88,000 voters in each district, including battleground states of California, Illinois and New York.

The DCCC invested more than $67 million in 39 districts and produced nearly 150 TV ads and 20 radio spots.

This year's elections are the most expensive ever, with total spending pegged at $3.67 billion compared to $3.6 billion spent during the 2010 midterms, according to the Center for Responsive Politics.