Senator Joe Manchin told Democratic leaders Thursday he would not support new spending on climate measures or tax increases, delivering a colossal blow to President Joe Biden’s ambitious economic agenda. The West Virginia Democrat’s decision, confirmed by three people familiar with the discussions, comes after more than a year of negotiations and just months before midterm congressional elections that will determine control of both chambers. Manchin told Majority Leader Chuck Schumer he’s only willing to support legislation to lower prescription drug prices and extend enhanced Affordable Care Act subsidies, the people said. That leaves Democrats in a position of accepting a much skinnier package shorn of nearly all of their long-term ambitions from a year ago, or getting nothing. Manchin’s vote is pivotal in the evenly divided Senate, where Democrats need a united caucus to pass the economic package by simple majority […]