Despite Sen. Hillary Clinton's victory in the Pennsylvania primary, it is very hard to imagine her winning the Democratic presidential nomination. But after Pennsylvania, it's easier to imagine Sen. Barack Obama losing to Republican John McCain in the fall. That possibility makes it a necessity for Mr. Obama to quit the recent nonstop verbal jabbing with Mrs. Clinton and refocus on issues of vital interest to voters - the current economic crisis, affordable health care, terrorism and an Iraq exit strategy.
Mr. Obama is leading in this race because he was the change candidate; he promised to build a broad-based coalition to find answers to pressing national problems. Young Americans and others ate it up, and the robust ranks of Democratic primary voters prove it. They were tired of campaigns dominated by personal attacks.
But in recent weeks, Mr. Obama has been drawn into the Clinton style of attack politics. And Mrs. Clinton has used to her advantage his inability to connect with conservative, moderate-income voters who have been the party's bedrock.
