Democrats in Congress have a plan for their summer vacation: talk about President Joe Biden s economic agenda, and then talk about it again and again and again.

The latest sign of this strategy, which Democratic and progressive groups are backing with tens of millions of dollars in television ads, is a new memo the Democratic Senatorial Campaign Committee sent to campaigns this week in which it outlined preferred messaging for the partys candidates over the next month.

Research shows that Democrats have an effective message regarding their legislative agenda and accomplishments, including: cutting taxes, growing jobs through investments in infrastructure and lowering health care costs, pollsters at the Democratic data firm OpenLabs wrote in the memo , which was obtained by HuffPost. Additionally, its particularly effective to highlight the contrast between Democrats and Republicans , who oppose these proposals while looking out for corporations and wealthy special interests.

Democrats, who have thin majorities in both chambers of Congress, view the popularity of their economic agenda which spans everything from a child tax credit worth up to $300 a month to investments in broadband to corporate tax hikes as key to staving off or limiting the gains parties out of power typically make during midterm election years.

Republicans, meanwhile, are focusing their rhetorical energy on social and cultural issues, including crime and the large number of migrants at the U.S.-Mexico border.

Democrats control the 50-50 Senate thanks to Vice President Kamala Harris ability to break tie votes. Four of their incumbents Sens. Mark Kelly (Ariz.), Raphael Warnock (Ga.), Maggie Hassan (N.H.) and Catherine Cortez Masto (Nev.) are seen as potentially vulnerable. Democrats are also targeting GOP-held seats in Michigan, Wisconsin and Pennsylvania.