Concerns about the spreading virus haven't stopped thousands from thronging campaign rallies in recent days
Another candidate, hedge fund billionaire Tom Steyer, has also pulled out
After a larger-than-expected win in South Carolina, Biden became the clear alternative to Bernie Sanders
Trump noted that decisions by two centrists -- Pete Buttigieg and Amy Klobuchar -- to drop out and endorse Biden had electrified the previously struggling vice president's campaign
In California, incumbents Dr Ami Bera and Ro Khanna registered an easy win in their respective seventh and 17th Congressional Districts. Both are from the Democratic party
Sanders targeted Biden's record on trade, Social Security and fundraising just hours after billionaire Mike Bloomberg suspended his campaign
Bloomberg's only victory on Tuesday came in the US territory of American Samoa
The former vice president got off to a strong start as 14 states voted to pick the Democratic nominee, with seven projected wins against two for Sanders
Sanders, a self-described democratic socialist on a mission to reshape America's economy, was projected to win as expected in his home state of Vermont
For the Democratic party, the results of the 'Super Tuesday' would allocate 1,357 of the 3,979 pledged delegates for the Democratic National Convention in Wisconsin later this summer
It would be wrong to say there was no substance to Trump's India tour. In fact, the mutual pay-off was significant.
There could be two out-of-the-box announcements ahead of the election to outline the Republican policy in Asia
Sanders, 78, had won the New Hampshire primary last week and was in a virtual tie with underdog Pete Buttigieg in Iowa
US intelligence warned that Russia is meddling in this year's elections
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Eventually, all precincts counted, the Iowa Democratic Party said, after technical glitches hindered the counting of votes in the fist contest for the Democratic presidential nomination
Senator Bernie Sanders, 78, more than double the age of young Buttigieg, a former mayor of South Bend in Indiana, was a close second as results started trickling
Just 41 Iowa delegates are up for grabs, a fraction of the 1,991 needed to secure the Democratic nomination
"Both the radical and the realist models warrant serious consideration," the board said.
Highlighting the politics of the city, Trump's rally was interrupted several times by protesters, who also demonstrated outside the arena where he spoke