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Securing the top spot for the presidential nomination early in the campaign has been the exception for Democrats over the past 60 years.
The job approval rating continues to provide a valuable way of summarizing a president's performance in a single measure.
Gallup's latest update finds President Donald Trump's job approval rating at 42%, about where it has been since May.
President Donald Trump's June 3-16 job approval rating is 43%, up slightly from 40% in the second half of May.
President Donald Trump's May 1-12 job approval rating stands at 42%, slightly below the 46% high reached in the second half of April.