Washington: Bernie Sanders won the crucial Michigan's primary on Tuesday night, chipping away at Hillary Clinton's dominance in the Democratic presidential race. On the other hand, Republican Donald Trump swept to victory in Hawaii, Michigan and Mississippi, overcoming fierce efforts to blunt his momentum.

In spite of Sanders' win, Trump and Clinton moved closer to a general election face-off. Clinton won in Mississippi, actuated by overwhelming support from black voters, and she now has more than half the delegates she needs to clinch the Democratic nomination. Trump expanded his lead over Texas Sen. Ted Cruz, his closest rival.

Recently, Ohio Gov. John Kasich campaigned hard in Michigan. However, he is yet to win a primary but hoped a good showing in Michigan would give him a boost heading into next week's crucial contest in his home state.

Republicans were also holding contests on Tuesday in Idaho and Hawaii. Republican candidates were fighting for 150 delegates, whereas 179 Democratic delegates were at stake in the party's two primaries. The delegates will select each party's presidential nominee at national conventions in the month of July.

It must be noted that US economy ranked high on the list of concerns for voters heading to the polls in Mississippi and Michigan. According to early exit polls conducted, at least 8 in 10 voters in each party's primary said they were worried about where the American economy is heading.

Among Democrats, 8 in 10 voters in both Mississippi and Michigan said the US economic system benefits the wealthy, not all Americans.

Sanders echoed that concern, energizing white working-class voters and young people with his calls for breaking up Wall Street banks and making tuition free at universities and public colleges.

On Tuesday, Sanders' troubles with black voters were evident once again. Clinton won nearly nine in ten black voters in Mississippi.