Barack Obama is under no obligation to govern like a centrist or temper his policy goals to accommodate a point-of-view that the American people have decisively rejected. Obama won. Elections have consequences.
McCain had to do the hard thing -- to not only accept loss and graciously congratulate the winner, but to encourage the rest of the country to offer their blessings to the new President-elect and his family.
If we do win, the victory will be historic not only for the margin but for the meaning. As Bill Clinton rightly pointed out this morning, Obama's election is not just about one man but about a fundamental philosophical shift.