Republicans are growing increasingly confident of winning the U.S. Senate race in Indiana, which Democrats hoped to lock up by luring former Sen. Evan Bayh into running for his old seat. Bayh’s early lead has dwindled rapidly in polls as outside groups pour money into the state. Instead, outside GOP groups including the Chamber of Commerce and the billionaire Koch Brothers have poured some $10 million into the race, eroding Bayh’s fund-raising advantage and closing his lead over Todd Young to low- or mid-single digits