In today's big story, President Joe Biden ended his reelection bid .
The president ended his reelection campaign on Sunday, the culmination of mounting pressure from his party after a disastrous debate last month.
Meanwhile, former President Donald Trump said in a post on Truth Social that "Crooked Joe Biden was not fit to run for President."
Biden's reelection campaign has quickly pivoted to serve Harris, making it an uphill battle for any Democrat looking to challenge her , writes Business Insider's Brent D. Griffiths.
Many have made comparisons to the 1968 Democratic convention , which was a contested convention after President Lyndon B. Johnson ended his reelection campaign earlier that year.
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