"African-American, Latino and younger voters failed to show up at the polls in sufficient numbers on Tuesday to propel Clinton into the White House," CNN reported.
Before polls closed the Clinton campaign had been confident of victory. In the end, however, she lost even some states thought to be safely in her column, like Wisconsin. She trailed in others, like Pennsylvania and Michigan, it noted.
While Clinton, 69, won the key demographic groups her campaign targeted, she underperformed President Barack Obama across the board, even among women, the network said in a report based on exit poll data.
President Obama, who captured the presidency with the help of the African-American and Latino communities, issued several personal pleas to black voters to back the Democratic Party nominee in recent weeks.
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But not enough African-Americans, along with Latinos, heeded the first black American president's call.
Some 88 per cent of African-American voters supported Clinton, versus 8 per cent for Republican Trump, as of early Wednesday morning. While that's a large margin, it's not as big as Obama's victory over Mitt Romney in 2012. Obama locked up 93 per cent of the black vote to Romney's 7 per cent.
This lowered turnout happened even after Trump repeatedly made sweeping comments about how black communities were in the worst shape ever. Referring multiple times to "inner cities," Trump said black people live in poverty, have no jobs and get shot walking down the street. "What do you have to lose?" he asked.
Clinton's support among Latinos was even more tenuous,
despite Trump pledging to build a wall on the Mexican border, accusing undocumented immigrants of being criminal aliens and promising to deport them.
Hispanics inched up to 11 per cent of the electorate, up from 10 per cent in 2012.
Beyond the Obama coalition, Clinton was also not as popular with white voters as Obama was. She won only 37 per cent of the white vote, compared to Obama's 39 per cent.
Surprisingly, Trump also garnered a slightly smaller share than Romney, capturing 58 per cent of the vote to Romney's 59 per cent. White voters made up 70 per cent of the electorate this year, down from 72 per cent four years ago.
She won 55 per cent of voters age 18 to 29, compared to 37 per cent who cast ballots for Trump. But Obama secured 60 per cent of these young voters to Romney's 37 per cent.
When it came to women voters, Clinton won 54 per cent compared to Trump's 42 per cent. Even though 70 per cent of voters said that Trump's treatment of women bothered them, they still didn't flock to the woman who could have broken the glass ceiling. Obama won 55 per cent of the women's vote in 2012.