According to a Washington Post-ABC News survey, President Joe Biden's approval rating has reached a new low and a growing number of voters doubt his "mental acuity." He now trails both Donald Trump and Ron DeSantis in head-to-head match ups. Also this week, Trump and DeSantis will make appearances in Iowa. RealClearPolitics president and co-founder Tom Bevan and Washington bureau chief Carl Cannon discuss on today's RCP Takeaway podcast.