Ed Klein’s book "The Amateur" reveals a lot about the Obamas. Books can be sensationalized for the purposes of sales so I am always suspicious of what is in them.
But here you go.
Obama ran in a Democratic primary against Congressman Bobby Rush and lost 2-to-1. Michelle had discouraged Barack from running but he ran anyways and ran up a campaign debt.
This debt caused a rift in their marriage and Michelle drew up divorce papers. In fact, Michelle would not allow Barack to run for the Senate until this debt was cleared.
Here are some quotes from the book:
“During the dark days that followed his defeat, he turned to Michelle for comfort. But she was in no mood for sympathy . . . He had refused to listen to her warnings about taking on” Bobby Rush for his Congressional seat.
“Michelle actually had divorce papers drawn up … Obama was so depressed that some of his friends worried that he was suicidal"
Other things pointed out from this book: