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Sanders outspends Clinton in April 26 primary states

Bernie Sanders is still outspending Hillary Clinton over the airwaves in five states with April 26 primaries.
U.S. Democratic presidential candidate Bernie Sanders is seen between the arms a supporter waving a sign as he speaks at a campaign rally in Hartford, Conn. on April 25, 2016. (Photo by Mike Segar/Reuters)
U.S. Democratic presidential candidate Bernie Sanders is seen between the arms a supporter waving a sign as he speaks at a campaign rally in Hartford, Conn. on April 25, 2016.

Bernie Sanders is still outspending Hillary Clinton over the airwaves.

His campaign has spent $4.6 million in ads in the April 26 primary states of Connecticut, Maryland, Pennsylvania and Rhode Island, according to ad-spending data from SMG Delta.

By comparison, the Clinton campaign has spent $2.4 million in those same states. (Delaware is also holding a primary on Tuesday, but it shares a media market with Pennsylvania - so it doesn't show up in the SMG Delta numbers.)

On the Republican side, outside groups opposing Donald Trump spent just $100,000 in these April 26 states, while Trump's campaign aired $1.3 million -- in Pennsylvania alone.

Yet looking ahead to next week's primary in Indiana, anti-Trump forces have spent $2 million in ads, while Ted Cruz and his allies have spent an additional $2.2 million. By contrast, Trump has spent $960,000 over the airwaves in the Hoosier State.

This article first appeared on NBCNews.com