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Paladin possibly, with his lay on hands (although the number of times per day depends on Wisdom?)I'm certainly curious whether a paladin and a ranger with the heal skill can compensate.
Ranger with heal skill might be a bit limited in that (IIR) the heal skill can only trigger a second wind, which a needy person might have used already.
In both cases, the other party members are going to have a bunch of healing surges left at the end of every encounter since they can only expend 1 per encounter... fine for getting up to scratch after the encounter is over, but likely to reduce the parties staying power considerably in the middle of a fight.
(in my campaign the paladin died relatively early from the dual problems of spending his healing surges on other people and underestimating the impact of getting surrounded by minions. On other occasions when the party has been without either cleric or warlord for some reason, they've had much less staying power in a fight)