Sanders, Biden prepare for Midwest contest as Democratic nomination heat up

Sanders questioned whether Biden could generate enough energy and enthusiasm to prevail against Trump

U.S. Democratic presidential candidates Joe Biden and Bernie Sanders will campaign in the Midwest on Saturday, as the two prepare for a showdown in Michigan, Missouri and four other nominating contests next week.

Sanders, who was until recently the front-runner in the party's race to face Republican President Donald Trump in November, is trying to regain momentum after Biden received a rush of endorsements from party establishment figures following his strong 'Super Tuesday' showing this week.

He has ramped up attacks on Biden in recent days, including at a rally in Detroit on Friday night, where he criticized the former vice president's