President Obama is walking a fine line in his 2011 budget.He

President Obama is walking a fine line in his 2011 budget.He is seeking $100 billion to tackle unemployment,while moving to trim the federal budget deficit.
RT,walk a fine line这里是什么意思
walk a fine line还有没有别的意思?有的话造个例句吧

Idiom Definitions for 'Walk a fine line'
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If you have to walk a fine line,you have to be very careful not to annoy or anger people or groups that are competing.('Walk a thin line' is an alternative.)
1.There's a fine line between boastful and confident.And you need to learn it.
在自负和自信之间有一条线,你需要知道这条线在哪.
2.Others say that there's a fine line between the pageants and sexual exploitation.
其他人说,选美和性剥削之间只有非常细微的界线.
3.She wished he would stop talking like that,but Minmei knew she was walking a fine line again.
她希望他不要再那么说话,可明美知道自己要小心行事才行.
4.Luxury-goods executives must walk a fine line when cutting prices.
奢侈品行业人士降价时必须特别谨慎.
5.So,you know,when I'm playing well on clay,it's a fine line that I kind of have to walk between those two.
所以你知道,当我在红土上打得很好,那么我需要掌握好这两方面.
It means to steer a risky and difficult course between two policies...to be so near the edge of one that you risk falling into another less desirable one.All of which is a pretty unclear definition,so maybe an example might help.
（下面这个句子和你的问题很相似）
"With his current policy approach towards Iraq,President Bush walks a fine line between the interests of national security and those of warmongering."
The metaphor's from tightrope walking,I'd guess.
朗文和麦克米兰和柯林斯词典都没有walk a fine line的解释这是一个新词语,应该是由walk a tightrope （这个idiom是可以在朗文上查到的）而来,国外论坛上也有人这么猜.
A fine line is a very thin thread like a fishing line.
正好我也看着CNN里面提到了a fine line to walk..一起学习吧.