California Senator Kamala Harris (L), Michigan Governor Gretchen Whitmer (2R) and New Jersey Senator Cory Booker (R) hold hands with Democratic presidential hopeful Joe Biden (2L) onstage during a campaign rally in Detroit, Michigan. [Image: AFP]
Surging US presidential candidate Joe Biden urged Michigan voters Monday to help him bolster his lead over Bernie Sanders as the rivals made their final pitches hours before the battleground state holds its Democratic primary.