Hard on the heels of yesterday’s Quinnipiac poll comes a survey from the Des Moines Register that confirms Ben Carson is now the leading Republican candidate in Iowa, with Donald Trump slipping into second place, and Senator Sen. Ted Cruz (R-TX) 96% nudging ahead of Senator Sen. Marco Rubio (R-FL) 80% for third. The Des Moines Register’s results are very similar to Quinnipiac: Carson 28, Trump 19, Cruz 10, Rubio 9. That’s a 10 point jump for Carson since the last poll in August, and a four-point slide for Trump. The second tier is a tie for fifth place, with...