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But the polling indicates that Democrats shouldn’t expect the president to offer much in the way of a coattail effect with his fellow churchgoers.

Before he came to stock car racing, McDowell was an instructor at the Bondurant Racing School in Chandler, Ariz. David Ragan clearly feels a coattail effect from having McDowell as a teammate at Front Row as he readies for Sunday’s Toyota/Save Mart 350 at Sonoma Raceway.

Voters tend to vote for the same party for president and the House, creating a coattail effect.

Using data from elections since 1948, Mr. Erikson estimates the coattail effect this way: Every percentage point added to a Clinton victory margin would add half a point to the average Democratic House candidate.

In baseball’s version of the coattail effect, Kansas City’s Omar Infante was in second place, just 150,000 votes behind Jose Altuve of Houston.