Two-thirds of Americans in a new ABC News/Washington Post/Ipsos poll " including a majority of Joe Biden's own supporters " say he should step aside as his party's presumptive nominee for president given his debate performance two weeks ago.

That's even as Biden continues to run evenly with Donald Trump, with no meaningful post-debate change in vote preferences.

Americans divide 46-47% between Biden and Trump if the election were today, almost identical to a 44-46% ABC/Ipsos poll result in April.

Among registered voters (though there's plenty of time to register) it's an absolute tie, 46-46%.

Were Vice President Kamala Harris to replace Biden as the Democratic nominee, vote choices are 49-46%, Harris-Trump, among all adults (and 49-47% among registered voters). Harris' 49% is slightly better than Biden's 46%, although she doesn't have a statistically significant lead over Trump.

This doesn't mean Biden didn't take on damage from the debate. Sixty-seven percent

overall say he should withdraw from the race. More, 85% now say he is too old for a second term, a new high, up from an already-broad 81% in April and 68% just more than a year ago.