Billionaire ex-mayor of New York City is focusing funds on House races to help Democrats retake majority in midtermsThe billionaire Michael Bloomberg will spend $80m to help Democratic candidates in the midterm elections, US media reported on Tuesday, a significant infusion of cash for a party that has recently struggled with fundraising as it seeks to win control of Congress.The reported donations came as Donald Trump announced on Tuesday he intended to spend a total of $400m to aid Republican