Few things are more generally harmful in politics than living in an echo chamber. It’s harmful to the constituents being ignored, it’s harmful to the development of diverse ideas, and it’s harmful to the ongoing toxic political landscape. It’s also harmful to 81-year-old incumbent presidents facing an uphill battle for re-election — but the team most closely surrounding President Joe Biden doesn’t appear to be aware of that, according to a new report. Simply titled “Top Dems: Biden has losing strategy,” the blistering report from Axios chronicled concerned Democrats who were — intentionally …