Actually, damn close to explicitly:
http://www.greensforimpact.com/doc/wjk.cfmI. The Difference Between Bush and Kerry
While John Kerry does not agree with us on all issues, we must be mindful of the fact that though Kerry’s positions and record on Iraq, fair trade, and corporate welfare are not ideal, his stances on many of these issues are preferable to, though not directly opposite those of George W. Bush. In addition, we must bear in mind that these are not the only issues about which progressives care. The fact John Kerry has supported public financing of campaigns, believes in a woman’s right to choose, is against the death penalty, and has a near-perfect voting record with the NAACP, the Sierra Club, and the AFL-CIO, indicates that a Kerry presidency would be a vast improvement over that of George W. Bush in at least several key areas. For working families, racial and ethnic minorities, women, union members, GLBT and other groups, George W. Bush’s policies have had real and long-term negative consequences on the quality of their lives that cannot be ignored. John Kerry offers the real chance to roll back the Bush tax cuts for the wealthiest Americans, while restoring social spending needed by our nation's poor, as he has pledged to do. While these subjugated groups would greatly benefit from the election of more progressive independent and third party candidates, John Kerry is the only left-of-center candidate who can realistically defeat Bush in November. That voters have so few choices of candidates who can actually win is an unfortunate consequence of our electoral rules, but it is nonetheless true.
While we all agree that voting one's conscience is virtuous, just what does our conscience tell us? If you live in a swing state, progressives are going to need every united vote they can muster, and as mentioned above John Kerry is the only candidate who can garner enough votes to defeat Bush. Does your conscience tell you to elect someone who will bring some degree of progress to civil rights, the environment, and poverty issues, or does it merely want to make a "statement"? Does your conscience tell you to support a candidate who believes in international environmental treaties, such as the Kyoto Protocol, or does it tell you that the Bush/Kerry divergence on this issue is inconsequential? Does your conscience actually tell you that John Kerry would give a multi-billion dollar, no-bid contract to Dick Cheney's Halliburton corporation for "services" in Iraq? Does your conscience tell you that John Kerry's consistent opposition to the death penalty does not stand in stark contrast to George W. Bush's 152 Texas executions? Vote your conscience.