Obama returned to Portland on Wednesday night and delivered a different sort of speech. His message of national unity and reconciliation had been replaced by a stark warning against cynical Republican tactics, vague threats to America’s political system and the urgent need to keep the GOP marginalized.

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There was less hope, more fear…

The darker message may be rooted in Obama’s experience as president. Nearly two years into the job, the partisan divisions are not going away.

“As a candidate in 2008, Obama made an appealing but naive promise to bring Republicans and Democrats together in Washington and end the bitter partisan standoff,” said Thomas Mann, a senior fellow at the Brookings Institution who studies and writes about governance. “He learned that was easier said than done.