USA TODAY WASHINGTON - A group of Democratic senators joined all Senate Republicans in voting against Sen. Bernie Sanders' proposal to increase the federal minimum wage to $15 per hour on Friday. The Vermont independent tried to add the provision to President Joe Biden's COVID-19 stimulus bill as the Senate considered the $1.9 trillion measure. But the effort failed in a 58-42 vote with eight members of the Senate Democratic caucus voting against it. The vote started at 11:03 a.m. EST Friday and didn't officially end for nearly 12 hours as Democrats and Republicans negotiated changes to an extension of unemployment benefits. The outcome of the vote could spell trouble for future Democratic attempts to raise the minimum wage, something Biden included in his initial stimulus proposal that passed the House last week.