The Democrats, though, have been taking solace in special election results since Donald Trump became President. Special election results haven't been nearly as good for Democrats since the beginning of April, however. In the median special election since April 1, Democrats have been outperforming the partisan baseline by only about half a point. In other words, Democrats aren't doing any better in special elections over the last two months than the generic congressional ballot would suggest that they should be doing. In fact, their overperformance in recent special elections has been about half as high as it had been in all special elections since January 2017.

Source: CNN May 25, 2018 00:56 UTC