Analysis: Among all-important Iowa voters, former President Donald Trump notched his highest favorability rating ever, according to the latest Des Moines Register/Mediacom Iowa Poll.53% of Iowans now have a favorable view of Trump.45% now have an unfavorable view of Trump.2% are not sure how they feel.Among that favorable/unfavorable split, this is Trump's "best showing ever on either metric in the Iowa Poll," the Register writes.