Joe Biden will confront a new political era as he launches his campaign

(CNN)Joe Biden’s mission in the presidential bid he will launch on Thursday is to prove he’s not a man out of step with the times. But Biden has one huge card to sell to Democrats desperate to oust Trump: He might be their best hope of beating the President, especially in the Midwestern, blue-collar heartland. And his experience and dignity could be the antidote to Trump’s rage. Biden enters the crowded primary after months of soul searching as a clear but not prohibitive front-runner. Invoking America’s better angels, Biden is offering experience and a character forged by tragedy to purge the scandals, lies and constitutional chicanery of the current President and to close the societal schisms he has widened. “We …