A pedestrian walks past the campaign offices for Republican candidate for the U.S. Senate Scott Brown in Manchester, New Hampshire May 10, 2014. Barack Obama and his Democratic allies in the Congress have grown more confident in recent months about their ability to use the president's signature healthcare law as a draw rather than a liability in this November's midterm elections. Reuters

Democratic Senate and House candidates have run more television ads than Republicans in recent weeks ahead of the 2014 midterm elections, research from Wesleyan University indicates. Researchers found from Aug. 29 to Sept. 11, 34,000 pro-Democrat Senate race ads aired across the U.S., compared to about 29,000 pro-Republican ads. Democrats’ lead in the number of ads for House candidates was even greater, with pro-Democrat ads outpacing pro-Republican ones by nearly 10,000.

“Forecasts of House races suggest that the Republicans will keep control of the chamber, but Democrats are working hard to hold on to -- or tip -- every competitive seat," Travis Ridout, co-director of the Wesleyan Media Project, said in a statement.

Mark Murray, senior political editor for NBC News, tweeted the results of the study Tuesday.

Advertising balance in U.S. House and Senate races. Wesleyan University