The current first lady, Melania Trump, came just behind Obama, according to a Gallup poll released Monday.
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According to the poll, Obama was the only woman to rank in double digits this year with 10 percent of the vote, down by 15 percent from last year.
The poll also stated President Trump and former President Barack Obama tied this year as the most admired man.
In July, an annual study conducted by an online research firm, YouGov, also ranked the former first lady as the most admired woman.
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The 2018 Gallup poll was conducted shortly after Obama released her bestselling book of 2018, "Becoming".
The top spot was previously held by Hillary Clinton for 17 years.
Each year since 1948, Gallup has conducted a survey asking which man and woman in the world they admire the most. This year's results were based on a Dec. 2-5 poll.