We should have known
Our new poll finds that Trump is benefiting from a GOP electorate that thinks Barack Obama is a Muslim and was born in another country, and that immigrant children should be deported. 66% of Trump's supporters believe that Obama is a Muslim to just 12% that grant he's a Christian. 61% think Obama was not born in the United States to only 21% who accept that he was. And 63% want to amend the Constitution to eliminate birthright citizenship, to only 20% who want to keep things the way they are.
Looks like The Donald's birtherists were his initial base of support and he's just expanded out from there. But it's not like that base is a small, marginalized slice of the GOP.
Trump's beliefs represent the consensus among the GOP electorate. 51% overall want to eliminate birthright citizenship. 54% think President Obama is a Muslim. And only 29% grant that President Obama was born in the United States. That's less than the 40% who think Canadian born Ted Cruz was born in the United States.