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What exactly is “the rear coat-tail pocket” of a “full dress suit?”

The revival had a coat-tail effect for the shows that followed, significantly boosting viewership for Black-ish and helping to launch new the Jenna Fischer-Oliver Hudson comedy Splitting Up Together.

Unlike Ronald Reagan in 1980 or Barack Obama in 2008, Trump didn’t have much of a “coat-tail effect” on down-ballot candidates.

The “coat-tail” effect generally works down the ballot, “from the White House to the courthouse”, says Larry Sabato of the University of Virginia; but when related worries—say, the whiff of nastiness—pervade the ticket, the influence can flow both ways.

Nigel Farage's party will benefit from the coat-tail effect of its expected strong showing in the European elections in many areas, although it is unlikely to take overall control of any councils.