WASHINGTON — Republicans this fall will be hoping that Bill Clinton was right about at least one thing. “It’s the economy, stupid — did you ever hear that one?” President Trump asked at his rally last week near Pittsburgh, bringing cheers and laughter from the crowd at his appropriation of that famous line from the 1992 presidential campaign. While the government shutdown has dominated headlines in recent days, Republican strategists are plotting an election-year survival strategy to steer the midterms away from the dangerous terrain of Trump’s tweets and Capitol Hill dysfunction — and focus attention on pocketbook issues that could tilt voters in favor of the party in power. GOP leaders and their allies plan to talk up job growth, highlight the soaring stock market and, most of all, convince voters that the tax-cut legislation that stands as their only major accomplishment is bringing back the good times. The effort represents an all-hands deployment by top Republican officials and their allies, with extensive travel in the coming months to key districts by Trump, Vice President Pence and Cabinet officials, as well as White House aides Ivanka Trump and Kellyanne Conway, to sell the tax overhaul.