Studies have shown that nonprofit organizations, including tax-exempt charities, foundations, and trade associations, tend to donate more to Democratic candidates and causes than to Republican ones. However, the degree to which this is true may vary depending on the specific type of nonprofit and the particular election cycle.

According to an analysis by the Center for Responsive Politics, which tracks campaign finance data, nonprofit organizations donated a total of $762 million to political candidates and causes in the 2018 election cycle. Of that amount, 57% went to Democratic candidates or causes, while 43% went to Republican candidates or causes.

This pattern of greater donations to Democrats by nonprofit organizations has been observed in other election cycles as well. For example, in the 2016 election cycle, nonprofit organizations donated a total of $730 million, with 51% going to Democrats and 49% going to Republicans.

It's worth noting that nonprofit organizations are subject to strict rules regarding political activity, and are prohibited from engaging in partisan political activity or endorsing or opposing specific candidates. However, they are allowed to engage in some types of issue advocacy and voter education, and may donate to political action committees (PACs) or other organizations that support candidates or causes aligned with their mission.

Overall, while nonprofit organizations do tend to donate more to Democratic candidates and causes than to Republican ones, it's important to recognize that there is significant variation within the nonprofit sector, and that the political giving patterns of individual organizations may vary depending on a variety of factors, including their mission, their donors, and the specific election cycle.