 Senator Richard Blumenthal, the latest Democrat to express doubts about President Biden's prospects for winning re-election in November. Bob Agnew has more. Senator Blumenthal told reporters he's deeply concerned about Biden's ability to win, but he was also quick to add that if he is a nominee, Biden will have his full support. He also called the re-election of Donald Trump an existential threat to the country. Behind closed doors, several Democrats expressed deep concerns on Tuesday about whether Biden can win, but no Democrat...