Politically, it can be risky for prestigious schools to be perceived as giving too many seats to outsiders.
Other lawmakers said they were wary of anything that could be perceived as giving Mr. Calderón more power.
But Western diplomats said both leaders face political trouble and personal danger if they are perceived as giving up too much.
Union negotiators say one obstacle to a settlement is that Dr. Levin may face criticism from board members and donors if he is perceived as giving too much or giving in to the union.
They believe that the Israeli leader, who faces pressure from the right wing to abandon the cease-fire, is not ready to do so and wants to be perceived as giving the truce plan a real chance.
In November, at a meeting with law professors, he was perceived as giving a disparaging response to a professor who objected to plans to move the law school's campus.
They aren't just calling for a restoration of conservative principles; they're out to get the people who are perceived as giving comfort to the enemy, in this case, the Democrats.If true, that is somewhat off-putting.
SAT tutoring and private college admissions counseling have long been perceived as giving an unfair advantage to the children of the wealthy, at least in the opinion of those who may be unable to afford such services.
In February, Senator Joseph R. Biden Jr. of Delaware, another presidential contender, also raised the prospect of rewriting the authorization to give American forces a much more limited role in Iraq, but that approach ran into resistance from Democrats who said it could be perceived as giving new authority for the war.
In a 2004 article, Richard Disney supported this argument: To the extent that pension contributions are perceived as giving individuals rights to future pensions, the behavioral reaction of program participants to contributions will differ from their reactions to other taxes.
