Coin Flips at the Iowa Primary -- Feb. 1, 2016

Sanders lost the first state to vote by 0.3 percent. On Election Day, several caucuses were so close they were decided by the flip of a coin. Diehard Sanders fans still talk about that fact as they lament party rules and regulations. On the flipside, Sanders emerged from Iowa with almost exactly the same number of delegates as Clinton.

Bernie Sanders Celebrates Win in New Hampshire -– Feb. 9, 2016

Sanders told ABC News’ Cecilia Vega days after the New Hampshire primary that it was his biggest victory to date and, yet, he barely had time to enjoy it.

\"Biggest political victory of my life, I haven't had a chance to read it,\" Sanders said.

The Vermont senator won his neighboring state by an astonishing 22 percent, more than either side had predicted. He celebrated by playing basketball with his grandkids before a victory rally in the state. Less than three weeks later, he would be trailing Clinton by 26 pledged delegates after losing Nevada and South Carolina.

Bernie Sanders celebrated #NHprimary victory by playing basketball with his grandchildren: https://t.co/OyRGKmmquzhttps://t.co/3dK0TWFJaW

— ABC News (@ABC) February 10, 2016

A Bird Lands on Sanders' Podium in Portland, Ore. -- March 25, 2016

Yea, Portland literally put a bird on it. During a rally in the town in March, a small sparrow landed on the senator’s stage. He seemed to almost beckon it with a flick of his hand and then stood in happy disbelief as it landed right on his podium. “Birdie Sanders” broke the Internet that day and spawned subsequent cultish artwork. Sanders himself called it a hopeful sign for world peace, because ... again ... Portland.

Bird lands on podium during @BernieSanders campaign event - @abcpolitics https://t.co/MmgmpbG9Zn

— ABC News Politics (@ABCPolitics) March 25, 2016

Bernie Sanders Lights Up New York City With Washington Square Park Rally -- April 14, 2016

Clinton won a resounding and decisive victory in New York, beating Sanders by 16 percentage points and all but clinching the nomination. Still, with an eye-popping event in the city’s iconic Washington Square Park, Sanders reinforced the fact that young people flock to him. With over 27,000 people, according to the campaign, filling parking space and surrounding blocks, the Brooklyn-born Sanders had an undeniably memorable night.

.@BernieSanders says no doubt his campaign has momentum -says looking at enormous crowd he thinks they'll win in NY pic.twitter.com/pZiNoQfDDe

— MaryAlice Parks (@maryaliceparks) April 14, 2016

His Campaign Today

Despite his overwhelming delegate deficit and mounting pressure from the Clinton campaign and some voters to concede and begin the process of unifying the Democratic Party, Sanders has instead pledged in recent days to fight on until the last vote is cast.

While he has scaled back his team, he has not yet scaled back his travel plans. The senator flew this week out to Oregon for a day of events, before heading back to Indiana to keep campaigning as the Tuesday primary approaches.

\"PHOTO:
Jacquelyn Martin/AP Photo
PHOTO: Sen. Bernie Sanders and his wife Jane Sanders board a plane in Columbia, S.C., Feb. 24, 2016.
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