The latest survey from Public Policy Polling shows that nearly half of the Republican voters in Iowa are Birthers — and another 26% “aren’t sure” whether President Obama was born in the US.

And this is also reflected in the national numbers, in poll after poll. The Republican base has gone completely looney tunes — the majority now believe a scurrilous racist myth about the first African American president.

This is why, when I see arguments that Donald Trump’s previous liberal stances will hurt his chances with the GOP base, I have to laugh. Trump is leading the pack, or close to the top in most of the polls, because he’s giving the Republican voter exactly what he/she wants. His past positions are simply irrelevant to this crowd.