His possible bid faces broad resistance: 63% of Americans, including 46% of Republicans, say they definitely will not vote for Trump for president. In comparison, 46% of Americans say they definitely will not vote for President Obama — significantly lower but itself a hurdle to winning the 2012 election…

Support from the “birthers” is stronger for Sarah Palin, Mike Huckabee and Mitt Romney. The issue has persisted even though Hawaii has released an official Certificate of Live Birth showing Obama was born there, a fact confirmed in non-partisan investigations by FactCheck.org and others.

Still, in the USA TODAY poll, only 38% of Americans say Obama definitely was born in the USA, and 18% say he probably was.