Senator Bernie Sanders is a decent human being and a passionate politician. He is also a grave threat to the Democratic Party. Because the Democratic Party is currently the only major U.S. party devoted to moderation and rational empiricism, Sanders's robust campaign for president is consequently a threat to the U.S. as well.
The Republican Party has been debilitated, as a source of policies and as a governing party, by the ever more stringent ideological demands that the party's powerful and adamant fringe imposes on its diminished and enfeebled center. It has succumbed so thoroughly to the paranoid style of politics that the leading Republican presidential candidate from the so-called establishment wing routinely suggests that President Barack Obama is a nefarious agent of the nation's doom. Delusional, rancid talk has become so commonplace on the right that it rarely merits notice anymore.