GOP’s SALT Failure Gives Democrats Cudgel in Tight House Races

Blue state House Republicans are on defense over a federal cap on the wildly popular state and local tax deduction—with Democrats gleefully reminding voters how it came to be.

Members of both parties in Democratic-leaning states oppose the GOP 2017 tax law’s $10,000 deduction limit. But Republicans have had control of the House for the past two years, making them vulnerable to attacks from Democrats for failing to change it.

“Everybody wants it to go away,” said Lawrence Levy, executive dean at Hofstra’s National Center for Suburban Studies. “The question is, which party do you trust to do the things ...