At the Washington Post‘s Monkey Cage blog, John Sides highlights the fact that despite Donald Trump’s ascension to the presumptive nominee of the GOP, forecasters on Good Judgment Open have not changed their minds on the chances that Republicans lose their majority in the Senate.
To be sure, there is some research suggesting that presidential candidates do have “coattails” in Senate races. The better a party’s presidential candidate does, the better that party’s Senate candidates do. We may therefore see the Democrats’ chances in the Senate increase if Trump’s chances in November decrease. But it hasn’t happened yet.
John Sides, June 15 2016, Monkey Cage