Biden and Trump secure their parties’ presidential nominations

Not even presidents can reverse time, so there’s only so much Joe Biden can do to defuse one of his top general election liabilities – his advanced age.But Biden, 81, appears to be in far better shape on this question than he was a week ago – and not just because he charged past the magic number of convention delegates needed to clinch the 2024 Democratic nomination on Tuesday evening.The president’s vigorous State of the Union address has partly reset the political narrative and is still delivering dividends. The prime-time look at Biden in his element, dominating the stage,…