The presidential candidate who cried "wolf"

For years Donald Trump has been publicly doubting that President Obama was born in the U.S.  He demanded to see his birth certificate and then questioned its authenticity when he did see it.

Now Trump is trying to make the case that Ted Cruz, born in Canada, is not qualified to be president.  Unfortunately for Trump, a poll released last September found that Republicans were more likely to believe that Obama was born abroad than believed that Ted Cruz was.