Obama calls Kaine an 'optimist,' 'progressive fighter'
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President Obama heaped praise on Hillary ClintonHillary Diane Rodham ClintonNevada Senate passes bill that would give Electoral College votes to winner of national popular vote 2020 Dems break political taboos by endorsing litmus tests Iowa Democrats brace for caucus turnout surge MORE's running mate Sen. Tim KaineTimothy (Tim) Michael KaineIraq War looms over Trump battle with Iran Senate passes bill to undo tax increase on Gold Star military families The Hill's Morning Report - White House, Congress: Urgency of now around budget MORE (D-Va.) in a fundraising email Saturday, calling him a "progressive fighter." 

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"Like Hillary, Tim is an optimist. But like Hillary, he is also a progressive fighter," Obama wrote in a Democratic Party fundraising email. 

Kaine, who was reportedly on Obama's VP shortlist in 2008, was announced as Clinton's vice presidential pick Friday night. 

The presumptive Democratic nominee will hold a campaign rally on Saturday to introduce Kaine to supporters ahead of the Democratic National Convention in Philadelphia next week. 

"He's the son of a teacher and an iron worker who's always got working families on his mind. He spent nearly two decades and specialized in representing people who had been denied fair access to housing just because of what they looked like, or because they they had a disability," Obama wrote. 

"And when a gunman killed 32 people on the campus of Virginia Tech, Tim knew he had a responsibility as governor to offer more than thoughts and prayers to the community he mourned with — and as a gun owner, he stood up to the gun lobby on their behalf."

Obama concluded the email by saying "you just can't find anyone with a bad thing to say about him."