Trump's unpopularity threatens Republican midterm prospects, signaling potential Democratic gains.
Context
What happened: With 30 days until the midterm elections, Republican Super Pacs have spent hundreds of millions on advertising and outreach, and Trump and top Republicans are campaigning for vulnerable lawmakers, but polls show Democratic Senate candidates leading in several states.
Key numbers: 30 days until the midterms;
Why it matters: The content reports that money and rallies have not improved Republican prospects, with Trump's low approval and economic discontent cited as major causes, while Republicans point to a cash edge and districts won by Trump as paths to holding Congress.