House Democrats' campaign arm once again outraised its Republican rival last month, according to summaries of fundraising reports released Tuesday.

The Democratic Congressional Campaign Committee raised $10.9 million from donors in June and has $50.9 million in its bank accounts, officials said. At the same time, the National Republican Congressional Committee said donors gave another $9.6 million to the committee tasked with keeping House Republicans in the majority.

The Democrats' campaign committee has outraised the GOP in 16 of the last 18 months despite long odds of tipping control of the chamber away from Republicans. The Democrats have now raised almost $125 million since the last elections and have been spending heavily to help their incumbents and candidates.

House Republicans' campaign arm has $42.5 million in the bank and has raised $101 million this election cycle.

Republicans are expected to hold onto their majority in November's elections. Redrawn congressional districts after the 2010 census heavily favor Republicans, and the party that holds the White House historically has lost seats in elections at this point in a president's term. President Barack Obama, a Democrat, is unpopular in many congressional districts.

Yet political giving and spending have continued at a rapid clip. The NRCC has booked $30 million in air time ahead of November's elections. Democrats have reserved $44 million in advertising.

House Republicans have 234 seats and Democrats have 199 seats. There are two vacancies.