Ron Brownstein: “Of all the dynamics threatening the GOP this year, the most menacing may be the unusually direct connection voters are drawing between their economic frustrations and the policies that President Donald Trump and congressional Republicans have implemented.”“Presidents always suffer from proximity when Americans are discontented about the economy. But this year, Trump faces an additional level of vulnerability. A significant majority of voters consistently say in polls that they believe his policies — particularly surrounding tariffs and the Iran war — are exacerbating the problem that most concerns them: the high cost of living.”