Sanders riding wave of momentum with 7 wins in 8 contests
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Democratic presidential hopeful Bernie SandersBernie SandersSupport drops for Medicare for All but increases for public option Hillicon Valley: Warren takes on Facebook over political ads | Zuckerberg defends meetings with conservatives | Civil liberties groups sound alarm over online extremism bill On The Money: Trump touts China trade deal | Wall Street, Washington see signs for caution | Trump threatens sanctions on Turkey | Sanders proposes sharp hike to corporate taxes MORE's wave of momentum is growing, with another state win Tuesday in Wisconsin, his seventh victory of the past eight contests.

The results of Democrats voting abroad were announced on March 21. Then on March 22, Sanders won in Idaho and Utah, but not in Arizona. Four days later, he swept caucuses in Alaska, Hawaii and Washington. 

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The Vermont senator has been touting his success, claiming that he is beginning to convince Democratic superdelegates to support him instead of former Secretary of State Hillary ClintonHillary Diane Rodham ClintonSaagar Enjeti: Tuesday's Democratic debate already 'rigged' against Gabbard, Sanders Ilhan Omar raises .1 million in third quarter Bloomberg rethinking running for president: report MORE.

"I think the momentum is with us," Sanders said the day after his caucus sweep. "A lot of these superdelegates may rethink their positions with Secretary Clinton."

March also saw the Sanders campaign set a new fundraising record, with the $44 million for the month, largely in small online donations.

But even with his momentum and financial resources, Sanders is still facing an uphill battle in the delegate race.

Sanders entered Tuesday trailing Clinton by 263 pledged delegates, according to The Associated Press. But because Democrats award their delegates proportionally, he would need to start winning states by large margins in order to catch up.

And even if he manages that, his chances may rest on winning over superdelegates, the majority of whom have backed Clinton. She has won over 469 superdelegates so far, while Sanders only has 31.