WASHINGTON — When Sen. Joe Manchin III and Senate Majority Leader Charles E. Schumer landed a surprise agreement on a health care, climate and tax bill last month, all but one Senate Democrat accepted the deal rather than risk collapse with further negotiation.
Sen. Kyrsten Sinema, the inscrutable Arizona Democrat who has at times voted against her party’s demands, staked her vote on two changes. Most attention focused on her push to eliminate a proposed tax on wealthy investors.
But Sinema’s last-minute efforts also added $4 billion to address the water crisis along the Colorado River as the region endures its most intense drought in centuries, a 23-year run of extreme dryness compounded by the effects of climate change.
